feat: video analysis switched to push mode (upload whole video, sync response)

Rationale: Oracle cannot reach NAS (Tailscale userspace mode on NAS, no TUN),
the old pull+webhook design requires Edge to download video from NAS and
callback to NAS - both blocked. New design is one-way NAS -> Oracle:

- FAM-Edge: new POST /api/edge/video/push endpoint accepts multipart video
  upload, reuses existing OpenCV scene-change keyframe selection, analyzes
  synchronously and returns the result payload directly in the HTTP response
  (no webhook callback). Old /api/edge/video/analyze kept for compatibility.
- FAM-Edge: VideoPreprocessor.save_upload() saves the uploaded file
- FAM-Edge: AIOrchestrator.process_push_task() runs the full pipeline
  (health check -> extract -> select -> compress -> VLM -> fusion) and
  returns callback-style payload dict
- FAM-Core: Dispatcher rewritten to push mode - reads local video file,
  uploads with task metadata (camera_name, event_start_time from file mtime,
  known_members_context), applies the result to DB via shared
  event_receiver.apply_success_event()
- FAM-Core: event_receiver success logic extracted into reusable
  apply_success_event() (used by both webhook route and dispatcher)
- config: edge_url -> /api/edge/video/push, push_timeout 1800s, gunicorn
  Edge timeout raised to 1800s for long synchronous analysis

fam-core/src/fam_core/dispatcher/dispatcher.py

@@ -1,9 +1,15 @@
 """
-Dispatcher - 30s 轮询 PENDING 任务，下发至 Edge
+Dispatcher - 30s 轮询 PENDING 任务，推送视频至 Edge（推送模式）
+
+流程（纯单向通信，NAS → Oracle，无需 Oracle 反向访问 NAS）:
+1. 读取任务对应的本地视频文件
+2. multipart 上传至 Edge /api/edge/video/push（附已知成员清单等元数据）
+3. Edge 同步抽帧+分析，结果直接随 HTTP 响应返回
+4. Dispatcher 收到响应后直接写 monitor_events/event_details，任务标记 SUCCESS
 
 退避重试: min(60 * (retry_count + 1) * 2, 600) 秒
-payload 注入 family_members 表的已命名+未命名成员清单
 """
+import os
 import time
 import threading
 import requests
@@ -12,18 +18,22 @@ from datetime import datetime, timedelta
 from ..logger import setup_logger, log_task
 from ..config_loader import load_config
 from .. import db_layer
+from ..event_receiver.event_receiver import apply_success_event
 
 logger = setup_logger('fam-core.dispatcher')
 
 
 class Dispatcher:
-    """任务下发器，30s 轮询"""
+    """任务下发器，30s 轮询（推送模式）"""
 
     def __init__(self):
         cfg = load_config()
         self.poll_interval = cfg.get('dispatcher', {}).get('poll_interval', 30)
-        self.edge_url = cfg.get('dispatcher', {}).get('edge_url', 'http://localhost:5000/api/edge/video/analyze')
+        self.edge_url = cfg.get('dispatcher', {}).get('edge_url', 'http://localhost:5000/api/edge/video/push')
         self.max_retries = cfg.get('dispatcher', {}).get('max_retries', 3)
+        # 推送+分析全程同步，耗时较长（大视频上传 + ARM 多帧分析）
+        self.push_timeout = cfg.get('dispatcher', {}).get('push_timeout', 1800)
+        self.camera_name = cfg.get('scheduler', {}).get('camera_name', '默认摄像头')
         self._running = False
         self._thread = None
 
@@ -42,41 +52,83 @@ class Dispatcher:
         return True
 
     def _build_payload(self, task):
-        """构建下发 payload，注入已知成员清单"""
-        known_members = db_layer.get_known_members_context()
-        return {
-            "task_id": task['task_id'],
-            "video_url": task['video_url'],
-            "webhook_url": load_config().get('dispatcher', {}).get(
-                'webhook_url', 'http://localhost:8000/api/core/callback/event'
-            ),
-            "known_members_context": known_members
+        """构建推送元数据，注入已知成员清单与事件时间"""
+        video_path = task['video_path']
+        payload = {
+            "task_id": str(task['task_id']),
+            "camera_name": self.camera_name,
+            "known_members_context": db_layer.get_known_members_context(),
+            "event_start_time": "",
+            "event_end_time": "",
         }
+        # 用文件 mtime 近似事件开始时间
+        try:
+            mtime = os.path.getmtime(video_path)
+            start_dt = datetime.fromtimestamp(mtime)
+            payload["event_start_time"] = start_dt.strftime('%Y-%m-%d %H:%M:%S')
+        except OSError:
+            pass
+        return payload
 
     def _dispatch_one(self, task):
-        """下发单个任务"""
+        """推送单个任务：上传视频 → 同步等结果 → 直接写库"""
         task_id = task['task_id']
+        video_path = task['video_path']
+
+        # 本地视频必须存在，否则直接失败（重试无意义）
+        if not video_path or not os.path.isfile(video_path):
+            db_layer.update_task_status(
+                task_id, 'FAILED',
+                error_message=f"视频文件不存在: {video_path}",
+                failure_stage='upload'
+            )
+            logger.error(f"[task_id={task_id}] 视频文件不存在，标记 FAILED: {video_path}")
+            return
+
         payload = self._build_payload(task)
+        size_mb = os.path.getsize(video_path) / (1024 * 1024)
+        db_layer.update_task_status(task_id, 'PROCESSING')
+        log_task(logger, task_id, 'dispatcher',
+                 f'推送视频至 Edge: {self.edge_url} ({size_mb:.1f}MB)')
 
         try:
-            log_task(logger, task_id, 'dispatcher', f'下发至 Edge: {self.edge_url}')
-            resp = requests.post(self.edge_url, json=payload, timeout=30)
-
-            if resp.status_code == 202:
-                db_layer.update_task_status(task_id, 'PROCESSING')
-                log_task(logger, task_id, 'dispatcher', 'Edge 接受任务，状态切换为 PROCESSING')
-            elif resp.status_code == 429:
-                logger.warning(f"[task_id={task_id}] Edge 队列已满 (429)，稍后重试")
-            elif resp.status_code == 503:
-                logger.warning(f"[task_id={task_id}] Edge Ollama 不可用 (503)，退避重试")
-                self._schedule_retry(task)
-            else:
-                logger.error(f"[task_id={task_id}] Edge 返回异常状态码: {resp.status_code}")
-                self._schedule_retry(task)
-
+            with open(video_path, 'rb') as fh:
+                resp = requests.post(
+                    self.edge_url,
+                    data=payload,
+                    files={'video': (os.path.basename(video_path), fh, 'video/mp4')},
+                    timeout=self.push_timeout
+                )
         except requests.RequestException as e:
-            logger.error(f"[task_id={task_id}] 下发失败: {e}")
+            logger.error(f"[task_id={task_id}] 推送失败: {e}")
             self._schedule_retry(task)
+            return
+
+        if resp.status_code == 429:
+            logger.warning(f"[task_id={task_id}] Edge 忙 (429)，回到 PENDING 稍后重试")
+            db_layer.update_task_status(task_id, 'PENDING')
+            return
+
+        if resp.status_code != 200:
+            logger.error(f"[task_id={task_id}] Edge 返回异常状态码: {resp.status_code}")
+            self._schedule_retry(task)
+            return
+
+        result = resp.json(silent=True) or {}
+        if result.get('status') == 'success':
+            try:
+                event_id = apply_success_event(task_id, result)
+                log_task(logger, task_id, 'dispatcher', f'推送任务完成: event_id={event_id}')
+            except Exception as e:
+                logger.error(f"[task_id={task_id}] 结果落库失败: {e}", exc_info=True)
+                db_layer.update_task_status(
+                    task_id, 'FAILED', error_message=str(e), failure_stage='callback')
+        else:
+            error_message = result.get('error_message', 'unknown')
+            failure_stage = result.get('failure_stage', 'edge')
+            logger.error(f"[task_id={task_id}] Edge 分析失败: stage={failure_stage}, error={error_message}")
+            db_layer.update_task_status(
+                task_id, 'FAILED', error_message=error_message, failure_stage=failure_stage)
 
     def _schedule_retry(self, task):
         """调度重试"""

fam-core/src/fam_core/event_receiver/event_receiver.py

@@ -45,6 +45,49 @@ def _upsert_abstract_members(frame_details: list):
         logger.info(f"upsert family_member: {label} (feature={feature})")
 
 
+def apply_success_event(task_id, data: dict) -> int:
+    """将成功结果写库，返回 event_id
+
+    供两条路径复用:
+    - webhook 回调路由 (拉取模式)
+    - Dispatcher 收到推送模式同步响应后直接落库
+    """
+    # 1. 插入 monitor_events
+    event_id = db_layer.insert_event(
+        task_id=task_id,
+        event_start_time=data['event_start_time'],
+        event_end_time=data['event_end_time'],
+        camera_name=data.get('camera_name', ''),
+        global_summary=data.get('global_summary', ''),
+        entities_json=data.get('entities_json', []),
+        compute_provider=data.get('compute_provider', [])
+    )
+
+    # 2. 遍历 frame_details 逐条插入
+    frame_details = data.get('frame_details', [])
+    for frame in frame_details:
+        db_layer.insert_event_detail(
+            event_id=event_id,
+            task_id=task_id,
+            frame_index=frame.get('frame_index', 0),
+            frame_timestamp=frame.get('frame_timestamp', ''),
+            camera_name=frame.get('camera_name', data.get('camera_name', '')),
+            person=frame.get('person', '未知'),
+            action=frame.get('action', ''),
+            clothing=frame.get('clothing', ''),
+            is_attention_event=frame.get('is_attention_event', False),
+            source_providers=frame.get('source_providers', [])
+        )
+
+    # 3. 对未命名的 abstract_label 自动 upsert
+    _upsert_abstract_members(frame_details)
+
+    # 4. 更新任务状态
+    db_layer.update_task_status(task_id, 'SUCCESS')
+    logger.info(f"[task_id={task_id}] 事件处理完成: event_id={event_id}, frame_details={len(frame_details)}条")
+    return event_id
+
+
 @event_bp.route('/api/core/callback/event', methods=['POST'])
 def receive_event():
     """接收 Edge 回调"""
@@ -58,40 +101,7 @@ def receive_event():
 
     if status == 'success':
         try:
-            # 1. 插入 monitor_events
-            event_id = db_layer.insert_event(
-                task_id=task_id,
-                event_start_time=data['event_start_time'],
-                event_end_time=data['event_end_time'],
-                camera_name=data.get('camera_name', ''),
-                global_summary=data.get('global_summary', ''),
-                entities_json=data.get('entities_json', []),
-                compute_provider=data.get('compute_provider', [])
-            )
-
-            # 2. 遍历 frame_details 逐条插入
-            frame_details = data.get('frame_details', [])
-            for frame in frame_details:
-                db_layer.insert_event_detail(
-                    event_id=event_id,
-                    task_id=task_id,
-                    frame_index=frame.get('frame_index', 0),
-                    frame_timestamp=frame.get('frame_timestamp', ''),
-                    camera_name=frame.get('camera_name', data.get('camera_name', '')),
-                    person=frame.get('person', '未知'),
-                    action=frame.get('action', ''),
-                    clothing=frame.get('clothing', ''),
-                    is_attention_event=frame.get('is_attention_event', False),
-                    source_providers=frame.get('source_providers', [])
-                )
-
-            # 3. 对未命名的 abstract_label 自动 upsert
-            _upsert_abstract_members(frame_details)
-
-            # 4. 更新任务状态
-            db_layer.update_task_status(task_id, 'SUCCESS')
-            logger.info(f"[task_id={task_id}] 事件处理完成: event_id={event_id}, frame_details={len(frame_details)}条")
-
+            event_id = apply_success_event(task_id, data)
             return jsonify({"status": "ok", "event_id": event_id}), 200
 
         except Exception as e: