fix(bruno): convert drifted body keys to body.data — CLI scenario runs now carry bodies

Follow-up to the sweep route audit, correcting its diagnosis: the CLI
DOES read .yml bodies — via OpenCollection's `body.data` string form
(the NewDevDBSetup script always worked because it used it). The
failing scenario POSTs used `body.json` (structured) / `body.jsonBody`
(string) — keys the CLI silently ignores, sending Content-Length: 0
with form-urlencoded content-type, so every server bind failed.

- 81 bodies converted to data-form (json maps serialized; jsonBody
  strings kept verbatim, {{vars}} intact).
- 6 pre-existing TRUNCATED payloads repaired: the original generator
  cut bodies at the first {{var}} (every SHA-256-identified scenario
  plus Sync Progress/Sync Bookmarks shipped mid-JSON and 400'd from
  day one). Rewritten whole, faithful to each file's documented
  purpose; book_sha256/book_uuid added to the environment.
- environments: opds_base_url correction from the sweep retained.

Verified live against the rebuilt dev container: the full koreader
scenario tree runs green through `bru run` — 14/14 (202s across
immediate/checkpoint/SHA-256 progress, 200s bookmarks, highlights,
notes; SHA-256 book identification exercised against a real
file_sha256).

bruno/devices/koreader/scenarios/Sync Progress - Multiple Books.yml

@@ -2,28 +2,8 @@ docs: "## Sync KOReader Progress - Multiple Books\n\nSynchronizes reading progre
   \ Batch Behavior:**\n- Triggered on device wake from sleep\n- Occurs during \"Sync now\" operation\n- Runs on WiFi connection\n- Limited to 100 books per request\n- Automatic retry on failed books\n\n**Performance:**\n- Small batch (2-10 books): 200-500ms\n- Medium batch (10-50 books): 500ms-2s\n- Large batch (50-100 books): 2-5s\n- Timeout: 30 seconds\n\n**Use Cases:**\n- Device initialization sync\n- Periodic background sync\n- Post-offline catch-up sync\n- Library-wide progress update\n- Before firmware update"
 http:
   body:
-    json:
-      books:
-      - authors:
-        - Author One
-        chapter: 1
-        epubcfi: epubcfi(/6/4/2:10)
-        last_read: '2026-01-30T19:00:00Z'
-        percentage: 0.25
-        progress: 0.25
-        title: Book One
-        uuid: '{{media_item_id}}'
-      - authors:
-        - Author Two
-        chapter: 8
-        epubcfi: epubcfi(/6/4/2:50)
-        last_read: '2026-01-30T20:00:00Z'
-        percentage: 0.75
-        progress: 0.75
-        title: Book Two
-        uuid: '{{media_item_id}}'
-      library_id: optional-library-uuid
     type: json
+    data: "{\n  \"books\": [\n    {\n      \"authors\": [\n        \"Author One\"\n      ],\n      \"chapter\": 1,\n      \"epubcfi\": \"epubcfi(/6/4/2:10)\",\n      \"last_read\": \"2026-01-30T19:00:00Z\",\n      \"percentage\": 0.25,\n      \"progress\": 0.25,\n      \"title\": \"Book One\",\n      \"uuid\": \"{{media_item_id}}\"\n    },\n    {\n      \"authors\": [\n        \"Author Two\"\n      ],\n      \"chapter\": 8,\n      \"epubcfi\": \"epubcfi(/6/4/2:50)\",\n      \"last_read\": \"2026-01-30T20:00:00Z\",\n      \"percentage\": 0.75,\n      \"progress\": 0.75,\n      \"title\": \"Book Two\",\n      \"uuid\": \"{{media_item_id}}\"\n    }\n  ],\n  \"library_id\": \"optional-library-uuid\"\n}"
   headers:
   - key: Content-Type
     value: application/json