test(bruno): sweep the collection against the actual route table

Audited every request (247 .yml files) against the routes the server
actually registers (extracted from internal/router, group prefixes
resolved). Results:

- 44 stale requests: deleted where the endpoint no longer exists
  (universal-progress GET/PUT /api/progress/:id — routes never existed,
  the handlers were deleted in H1; queue stats/clear-failed/process;
  admin profile page; auth/account) and FIXED where the endpoint exists
  under a different path (kobo token-in-path scheme: every
  /api/sync/kobo/<seg> and /api/v1/kobo/<seg> URL now carries
  {{kobo_device_token}}; /sync/* missing their /api prefix; koreader
  /api/v1/koreader/sync/* -> /api/sync/koreader/*; link-book and
  unlinked-books moved to /api/devices/:id/sync/*).
- koreader Sync Highlights/Sync Notes pointed at endpoints that never
  existed with a body shape to match — rewritten against POST
  /api/sync/koreader/bookmarks (the annotations funnel carries
  highlights and notes arrays).
- 9 files the GUI refused to load: 4 had bruno-invalid script type
  "tests" (converted to after-response), 4 were info/type:collection
  doc files with bogus http blocks (converted to folder.yml folder
  docs), 1 had a dead pre-YAML schema and no route (deleted).
- devices/koreader requests now carry request-level bearer auth
  ({{koreader_device_token}}) — they inherited the collection's user-JWT
  bearer, which device endpoints rightly reject — and their bodies
  reference {{media_item_id}} instead of dead placeholder uuids.
- environments: opds_base_url was empty (every OPDS request missed the
  /opds prefix); set to http://localhost:8765/opds and un-doubled the
  prefix in opds/scenarios.

Known limitation, for the handoff: bru CLI cannot execute .yml request
bodies (the collection is GUI OpenCollection format; the CLI runner
reads bodies from .bru files only). A .bru migration is the remaining
bruno work if CLI runs are wanted.

bruno/user/admin/scenarios/Delete User Account (Admin).yml

@@ -1,19 +0,0 @@
-info:
-  name: Delete User Account (Admin)
-  type: http
-  seq: 6
-http:
-  method: DELETE
-  url: '{{base_url}}/api/auth/account?user_id={{user_id}}'
-  auth: inherit
-  body:
-    type: none
-
-docs: |-
-  ## Delete User Account (Admin)
-    
-    Allows administrators to delete any user account by specifying user_id parameter.
-    
-    **Method:** DELETE
-    
-    **Endpoint:** /api/auth/account?user_id={user_id