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/scanner/Start Watch Mode.yml

@@ -8,25 +8,5 @@ http:
   auth: inherit
   body:
     type: json
-    jsonBody: "{\n    \"library_id\": \"{{library_id"
-
-docs: |-
-  ## Start Watch Mode
-    
-    Starts real-time file system monitoring for a specific library. New media items will be detected and processed almost instantly.
-    
-    **Method:** POST
-    
-    **Endpoint:** /api/scanner/watch/start
-    
-    **Authentication:** Required (Bearer token, Admin only)
-    
-    **Request Body:**
-    - `library_id` (string, required): UUID of the library to watch
-      - Example: `"550e8400-e29b-41d4-a716-446655440000"`
-    
-    **Response:** HTTP 200 (OK)
-    ```json
-    {
-      "message": "watch mode started for library",
-      "library_id": "550e8400-e29b-41d4-a716-446655440000"
+    data: "{\n    \"library_id\": \"{{library_id"
+docs: "## Start Watch Mode\n  \n  Starts real-time file system monitoring for a specific library. New media items will be detected and processed almost instantly.\n  \n  **Method:** POST\n  \n  **Endpoint:** /api/scanner/watch/start\n  \n  **Authentication:** Required (Bearer token, Admin only)\n  \n  **Request Body:**\n  - `library_id` (string, required): UUID of the library to watch\n    - Example: `\"550e8400-e29b-41d4-a716-446655440000\"`\n  \n  **Response:** HTTP 200 (OK)\n  ```json\n  {\n    \"message\": \"watch mode started for library\",\n    \"library_id\": \"550e8400-e29b-41d4-a716-446655440000\""