新增 docs/：商店文案、图标与各机型截图

Connect IQ Store 后台要填的素材都放进 docs/，代码不依赖其中任何文件。

截图
  八个屏宽各一张（218/240/260/280/360/390/416/454），外加七套主题各一张。
  全部是模拟器的真实渲染 —— 字体是 Garmin 内置的 Roboto / Bionic，和真机一致。
  preview-themes.svg 用的是网页字体，不能拿去当商店截图，docs/README.md 里
  特别提了这点。

  ⚠️ 进度环是摆拍的。模拟器的 Edit Activity Monitor Info 只能改活动分钟、
  恢复时间、呼吸和压力，改不了步数/距离/卡路里（那几个输入框是 Java 自绘的
  表格，AppleScript 也够不着），所以环在模拟器里永远全灰。截图构建把四段弧
  固定成了设计稿的填充状态。除环之外画面上每个数字都是模拟器的真实取值。

  数据位用的是日出/高低温/心率/身体电量，不是默认的日出/高低温/距离/步数 ——
  后两项在模拟器里是 0，截出来底部是 "0.0 0"。这些都写进 docs/README.md 了。

文案
  中英文各一份，含名称、简介、详细描述、关键词、以及要向用户解释的四项权限。
  详细描述按「进度环 / 四个数据位 / 七套主题 / 常亮 / OWM 选用 / 其它」组织，
  156 项字段按分类列出。

图标
  store-icon-1024.png 与 512.png，与启动图标同一套视觉（渐变环 + 橙色日期带），
  由 tools/gen_icons.py 的 launcher() 渲染。

docs/README.md 还记了后台要填但不在仓库里的项（分类、价格、隐私政策 —— 启用
OWM 时会把坐标发给 api.openweathermap.org，这点建议在描述里写明），以及发布
前必须先解决的设计稿授权问题。

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

docs/store-listing-en.md

@@ -0,0 +1,90 @@
+# Connect IQ Store listing (English)
+
+## App name
+
+```
+Fenix 8 V3
+```
+
+## Short description
+
+```
+A dense data watch face: four progress arcs, four configurable slots, 156 data
+fields to choose from, seven colour themes.
+```
+
+## Full description
+
+```
+Fenix 8 V3 packs a lot of information onto the dial without making it feel
+crowded.
+
+■ Four progress arcs
+The rim is split into four independent arcs. Each one tracks a metric of your
+choosing - steps, calories, distance, floors, move bar, active minutes or body
+battery - so a glance tells you where the day stands. Every tick is
+individually coloured, so the arc shifts hue as it fills.
+
+■ Four data slots, 156 fields
+Top-left, top-right, bottom-left and bottom-right. Each can show any of:
+
+  · Date & time   seconds, UTC, two alternate time zones, week number
+                  (ISO or calendar), custom time and date formats
+  · Activity      steps, calories, distance, floors, ascent, active minutes,
+                  plus week-to-date, 7-day and 28-day totals
+  · Body          heart rate, resting HR, stress, pulse ox, respiration,
+                  body battery, weight, BMI, recovery time, VO2 max
+  · System        battery, battery in days, alarms, notifications, do not
+                  disturb, bluetooth, solar intensity
+  · Environment   altitude, pressure, sunrise/sunset, next sun event, moon age
+                  and illumination, civil/nautical/astronomical twilight,
+                  golden hour, blue hour
+  · Weather       temperature, feels-like, high/low, humidity, precipitation,
+                  wind speed and direction, UV index, visibility, dew point
+  · From watch    next calendar event, training status, race and pace
+                  predictors (5k/10k/half/marathon), weekly run and bike
+                  distance, and complications published by your other apps
+  · Custom        three custom text lines, event countdown
+
+The captions under the bottom two slots follow whatever you pick - no separate
+setting to keep in sync.
+
+■ Seven themes
+Ember, Aurora, Brass, Voltage, Reef, Acid and Kelp. Each carries its own arc
+gradient, date band colours and time-digit gradient.
+
+■ Always-on display
+On AMOLED watches the face switches to a low-power layout while asleep: the
+date band fill and the progress ring are dropped, the time and date are dimmed,
+and the whole layout drifts a few pixels each minute to avoid burn-in.
+
+■ OpenWeatherMap (optional)
+Add your own OpenWeatherMap API key for 30 further weather fields, including
+air quality (AQI, PM2.5, PM10, CO) and the next two days' forecast. Without a
+key the watch face never touches the network.
+
+■ Also
+· English and Simplified Chinese - weekday, month and field captions all follow
+  the watch language
+· Temperature unit can be forced to Celsius or Fahrenheit; distance and
+  12/24-hour follow the watch
+· The bluetooth glyph dims when the phone is out of range
+```
+
+## Keywords / tags
+
+```
+data field, progress ring, complications, always-on, AMOLED, weather,
+heart rate, body battery, sunrise sunset, chinese
+```
+
+## Permissions to explain to users
+
+```
+· UserProfile - resting heart rate, weight, VO2 max
+· SensorHistory - pulse ox, body battery
+· Communications + Background - only used to fetch weather, and only when an
+  OpenWeatherMap API key has been entered
+· ComplicationSubscriber - calendar, training status, and data published by
+  other apps
+```