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/system/update-scan-settings.yml

@@ -4,22 +4,12 @@ info:
   seq: 2
 http:
   method: PUT
-  url: "{{base_url}}/api/libraries/scan-settings"
+  url: '{{base_url}}/api/libraries/scan-settings'
   auth: inherit
   body:
     type: json
-    json:
-      scan_poll_interval_seconds: 30
-      auto_scan_enabled: true
+    data: "{\n  \"scan_poll_interval_seconds\": 30,\n  \"auto_scan_enabled\": true\n}"
   headers:
-    - key: Content-Type
-      value: application/json
-
-docs: |-
-  ## Update System Scan Settings
-
-    Updates system-wide scan settings that apply to all libraries.
-
-    **Authentication**: Admin token required
-    **Request**: Scan frequency (15-1440 minutes) and enabled status
-    **Response**: Success message
+  - key: Content-Type
+    value: application/json
+docs: "## Update System Scan Settings\n\n  Updates system-wide scan settings that apply to all libraries.\n\n  **Authentication**: Admin token required\n  **Request**: Scan frequency (15-1440 minutes) and enabled status\n  **Response**: Success message"