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feat: presentation bot token and presenter management endpoints (#249)

* feat: add presentation bot token endpoint and local preview support

* feat: add presenter management endpoints (promote/demote/list)

Add REST endpoints for scene admins to manage presenters in cast rooms:
- POST /cast/presenter to promote a participant to presenter role
- DELETE /cast/presenter to demote a presenter back to watcher
- GET /cast/presenter to list current presenters in a room

Authorization checks ensure only scene admins can manage presenters.
Also sets canUpdateOwnMetadata=false for watchers to prevent metadata
impersonation.

* docs: add presentation-bot-token and presenter endpoints to OpenAPI spec

Document the new /cast/presentation-bot-token and /cast/presenter
endpoints with their request/response schemas.

* test: add integration tests for presenter handler and comms-scene presenter metadata

Add integration tests for:
- presenter-handler: GET/POST/DELETE with auth and error cases
- comms-scene-handler: presenter metadata for admins, non-admins, and
  fail-open on admin check failure

Also only pass skipAdminCheck to generateStreamLink when in preview
mode, keeping the call signature clean for production requests.

* refactor: introduce cast domain errors and remove handler try/catch

Replace UnauthorizedError usage in cast component with domain-specific
errors (InvalidStreamingKeyError, ExpiredStreamingKeyError, etc.).
Error-handler middleware now catches these directly, removing manual
try/catch from cast handlers. Also switches validatePresenterAdmin to
use sceneManager.isSceneOwnerOrAdmin for broader permission checks,
sets canUpdateOwnMetadata: false on streamer and bot tokens, and adds
local preview bypass for presenter admin validation.

* refactor: move ALLOW_LOCAL_PREVIEW check into livekit.isLocalPreview

The config flag is now checked inside the LiveKit component, removing
duplicate config reads from handlers. Also splits generateStreamLink
in... (continued)

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