#22957: fix(feishu): download media from quoted messages in group chats (#22872)

## Problem In Feishu group chats, image recognition is completely broken. When a user sends an image and then replies to it with @bot, the model receives a raw JSON string like `{"image_key":"img_v3_02v5_xxx"}` instead of the actual image. This happens because: 1. The quoted-message fetch path (`getMessageFeishu`) only extracts text content and never checks `contentType` for media types 2. History entries record raw `image_key` JSON for image messages DM image recognition works fine because the message itself is dispatched as an image type and goes through `resolveFeishuMediaList()`. ### Why this matters Feishu's UI does not allow sending an image and @mentioning the bot in the same message — images are sent immediately on selection. The only natural workflow in group chats is: send image → reply to it with @bot. This means there is **no working path** for image recognition in group chats. ## Changes ### Fix 1: Download media from quoted messages (high priority) When fetching a quoted message, check its `contentType`. For media types (image, file, audio, video, sticker, post), call `resolveFeishuMediaList()` to download the actual media and append it to the media payload sent to the model. ### Fix 2: Human-readable history entries for media messages Replace raw `{"image_key":"xxx"}` in history entries with human-readable placeholders like `[sent an image]` so the model gets useful context instead of cryptic JSON strings. ### Supporting change Add `rawContent` field to `FeishuMessageInfo` so the original JSON content is preserved for media key parsing by `resolveFeishuMediaList()`. ## Files changed - `extensions/feishu/src/bot.ts` — quoted message media download + history placeholder - `extensions/feishu/src/send.ts` — `rawContent` field in `FeishuMessageInfo` Fixes #22872 <!-- greptile_comment --> <h3>Greptile Summary</h3> This PR fixes Feishu group chat image recognition by downloading media from quoted messages and improving history entries. However, there's a critical bug: `mediaPayload` is created before quoted media is added to `mediaList`, so quoted media won't actually reach the agent. **Changes made:** - Added media download for quoted messages (image, file, audio, video, sticker, post) - Replaced raw JSON in history entries with readable placeholders like `[sent an image]` - Added `rawContent` field to preserve original JSON for media key parsing **Critical issue:** - `mediaPayload` on line 779:779 is built too early—before quoted media is added to `mediaList` on line 806:806. This means the fix won't work as intended. <h3>Confidence Score: 1/5</h3> - This PR has a critical logic bug that prevents the main feature from working - The PR addresses a real problem but contains a critical timing bug where `mediaPayload` is created before quoted media is added to `mediaList`. This means quoted media will be downloaded but never sent to the agent, breaking the intended functionality. The fix is straightforward—move the `buildAgentMediaPayload` call after all media collection is complete. - extensions/feishu/src/bot.ts requires immediate attention—the `mediaPayload` build timing bug must be fixed _{Last reviewed commit: 7d40875} <!-- greptile_other_comments_section --> <!-- /greptile_comment -->