接入系统 Complication，补齐倒计时/自定义格式/28天累计/空气质量

字段 125 → 156 项。

Toybox.Complications（source/Comp.mc）
  这条路推翻了我之前几个「表盘做不到」的判断 —— 当时只查了 ActivityMonitor /
  UserProfile / Weather，漏了系统把这些作为 complication 发布出来：
    - 下一个日程（CIQ 确实没有日历 API，但有 CALENDAR_EVENTS complication）
    - 训练状态、完赛预测 ×4、配速预测 ×4、最近高尔夫得分
    - 本周跑步 / 骑行距离（按运动分类的，按天历史做不出来）
    - 第三方 App 1–5（CGM、补水、行情这类 App 发布的）
  需要 ComplicationSubscriber 权限。

其余补齐
  - 近 28 天累计：步数 / 卡路里 / 距离 / 楼层
  - 事件倒计时：设置里填 YYYY-MM-DD，显示还剩几天
  - 自定义时间格式、日期格式 1/2：单字母占位符（h/H/m/s/a/D/M/N/Y/y/w）
  - OWM 空气质量：AQI 等级 + 描述 + PM2.5 + PM10 + CO，走
    /data/2.5/air_pollution —— 那个接口在免费档就开放，不需要 One Call 订阅

运行时踩的坑
  - Complication.unit 不保证是 String（周跑步距离返回的就不是），直接调
    .length() 抛 Symbol Not Found。unit 和 shortLabel 都改成先 instanceof 判型。
  - 浮点 value 直接 toString 印成 "0.000000"，统一格式化成一位小数。
  - 第三方 App 槽位每取一次就要走完整个迭代器，四个格子都选 App 时会走四遍。
    改成每帧只枚举一次，由 view 在绘制开始时调 Comp.beginFrame() 失效。

测试
  全字段验证的 harness 本身会触发看门狗（一次 onUpdate 里算 156 个字段），
  改成分批每帧 12 个。实际使用一帧只算 4 个，不受影响。
  156 项全部可渲染，零运行时错误；17 款设备全部编译通过。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/gen_fields.py

@@ -47,6 +47,10 @@ FIELDS = [
     (850, "Seconds",      "Seconds",              "秒",           "SEC",   "秒"),
     (869, "Seconds0",     "Seconds (09)",         "秒 (前导零)",  "SEC",   "秒"),
     (873, "WeekCal",      "Week Number",          "周数",         "WEEK",  "周"),
+    (861, "CustomTime",   "Custom Time Format",   "自定义时间格式", "TIME", "时间"),
+    (862, "DateFmt1",     "Date Format 1",        "日期格式 1",   "DATE",  "日期"),
+    (863, "DateFmt2",     "Date Format 2",        "日期格式 2",   "DATE",  "日期"),
+    (735, "Countdown",    "Event Countdown",      "事件倒计时",   "DAYS",  "倒计时"),
 
     # ---- activity -------------------------------------------------------
     (1,   "Steps",        "Steps",                "步数",         "STEP",  "步数"),
@@ -73,6 +77,10 @@ FIELDS = [
     (203, "FloorsWeek",   "Floors (Week to Date)", "本周楼层",    "WEEK",  "周楼层"),
     (204, "Floors7d",     "Floors (Last 7 Days)",  "近 7 天楼层", "7D",    "7天"),
     (200, "ActiveMin7d",  "Active Minutes (7 Days)", "近 7 天活动分钟", "7D", "7天"),
+    (828, "Steps28d",     "Steps (28 Days)",       "近 28 天步数", "28D",  "28天"),
+    (832, "Cal28d",       "Calories (28 Days)",    "近 28 天卡路里", "28D", "28天"),
+    (836, "Dist28d",      "Distance (28 Days)",    "近 28 天距离", "28D",  "28天"),
+    (840, "Floors28d",    "Floors (28 Days)",      "近 28 天楼层", "28D",  "28天"),
 
     # ---- body -----------------------------------------------------------
     (618, "HeartRate",    "Heart Rate",           "心率",         "HR",    "心率"),
@@ -137,6 +145,27 @@ FIELDS = [
     (314, "Visibility",   "Visibility",            "能见度",      "VIS",   "能见度"),
     (315, "DewPoint",     "Dew Point",             "露点",        "DEW",   "露点"),
 
+    # ---- 系统 Complication（含第三方 App 发布的）------------------------
+    # 这些走 Toybox.Complications，见 source/Comp.mc。
+    (612, "NextCal",      "Next Calendar Event",   "下一个日程",  "CAL",   "日程"),
+    (626, "TrainStatus",  "Training Status",       "训练状态",    "TRN",   "训练"),
+    (627, "Race5k",       "Race Time (5k)",        "5k 完赛预测", "5K",    "5K"),
+    (628, "Race10k",      "Race Time (10k)",       "10k 完赛预测", "10K",  "10K"),
+    (629, "RaceHalf",     "Race Time (Half)",      "半马完赛预测", "HM",   "半马"),
+    (630, "RaceFull",     "Race Time (Marathon)",  "全马完赛预测", "FM",   "全马"),
+    (631, "Pace5k",       "Pace (5k)",             "5k 配速预测", "5K",    "5K配速"),
+    (632, "Pace10k",      "Pace (10k)",            "10k 配速预测", "10K",  "10K配速"),
+    (633, "PaceHalf",     "Pace (Half)",           "半马配速预测", "HM",   "半马配速"),
+    (634, "PaceFull",     "Pace (Marathon)",       "全马配速预测", "FM",   "全马配速"),
+    (641, "GolfScore",    "Last Golf Round Score", "最近高尔夫得分", "GOLF", "高尔夫"),
+    (619, "RunWeek",      "Run Distance (Week)",   "本周跑步距离", "RUN",  "跑步"),
+    (620, "BikeWeek",     "Bike Distance (Week)",  "本周骑行距离", "BIKE", "骑行"),
+    (695, "App1",         "App 1 (on watch)",      "第三方 App 1", "APP1", "App1"),
+    (696, "App2",         "App 2 (on watch)",      "第三方 App 2", "APP2", "App2"),
+    (697, "App3",         "App 3 (on watch)",      "第三方 App 3", "APP3", "App3"),
+    (698, "App4",         "App 4 (on watch)",      "第三方 App 4", "APP4", "App4"),
+    (699, "App5",         "App 5 (on watch)",      "第三方 App 5", "APP5", "App5"),
+
     # ---- OpenWeatherMap -------------------------------------------------
     # Fetched by the background service; see source/Owm.mc.
     (500, "OwmTemp",      "OWM Temperature",       "OWM 气温",    "TEMP",  "气温"),
@@ -162,6 +191,11 @@ FIELDS = [
     (522, "OwmMinMaxTmrw", "OWM Min/Max Tomorrow", "OWM 明日高低温", "TMRW", "明日"),
     (535, "OwmDayAfter",  "OWM Temp Day After",    "OWM 后日气温", "D+2",   "后日"),
     (523, "OwmMinMaxD2",  "OWM Min/Max Day After", "OWM 后日高低温", "D+2",  "后日"),
+    (538, "OwmAqi",       "OWM Air Quality (AQI)", "OWM 空气质量", "AQI",  "空气"),
+    (539, "OwmAqiText",   "OWM AQI Description",   "OWM 空气质量描述", "AQI", "空气"),
+    (540, "OwmPm25",      "OWM PM2.5",             "OWM PM2.5",   "PM2.5", "PM2.5"),
+    (541, "OwmPm10",      "OWM PM10",              "OWM PM10",    "PM10",  "PM10"),
+    (542, "OwmCo",        "OWM CO",                "OWM 一氧化碳", "CO",    "CO"),
     (516, "OwmCity",      "OWM City Name",         "OWM 城市",    "CITY",  "城市"),
     (517, "OwmUpdated",   "OWM Update Time",       "OWM 更新时间", "OWM",   "更新"),
 
@@ -198,6 +232,22 @@ OTHER_SETTINGS = """
         <settingConfig type="numeric" min="-720" max="840"/>
     </setting>
 
+    <setting propertyKey="@Properties.CountdownDate" title="@Strings.SettingCountdownDate">
+        <settingConfig type="alphaNumeric" maxLength="10"/>
+    </setting>
+
+    <setting propertyKey="@Properties.TimeFmt" title="@Strings.SettingTimeFmt">
+        <settingConfig type="alphaNumeric" maxLength="16"/>
+    </setting>
+
+    <setting propertyKey="@Properties.DateFmt1" title="@Strings.SettingDateFmt1">
+        <settingConfig type="alphaNumeric" maxLength="16"/>
+    </setting>
+
+    <setting propertyKey="@Properties.DateFmt2" title="@Strings.SettingDateFmt2">
+        <settingConfig type="alphaNumeric" maxLength="16"/>
+    </setting>
+
     <setting propertyKey="@Properties.OwmKey" title="@Strings.SettingOwmKey">
         <settingConfig type="alphaNumeric" maxLength="40"/>
     </setting>