Implement job metadata extraction and task management features. Add validation for frame range limits, enhance job and task data structures, and introduce new API endpoints for metadata and task retrieval. Update client-side components to handle metadata extraction and display task statuses. Improve error handling in API responses.

internal/database/schema.go

@@ -175,6 +175,10 @@ func (db *DB) migrate() error {
 		`ALTER TABLE jobs ADD COLUMN allow_parallel_runners BOOLEAN NOT NULL DEFAULT 1`,
 		// Add timeout_seconds to jobs if it doesn't exist
 		`ALTER TABLE jobs ADD COLUMN timeout_seconds INTEGER DEFAULT 86400`,
+		// Add blend_metadata to jobs if it doesn't exist
+		`ALTER TABLE jobs ADD COLUMN blend_metadata TEXT`,
+		// Add task_type to tasks if it doesn't exist
+		`ALTER TABLE tasks ADD COLUMN task_type TEXT DEFAULT 'render'`,
 		// Add new columns to tasks if they don't exist
 		`ALTER TABLE tasks ADD COLUMN current_step TEXT`,
 		`ALTER TABLE tasks ADD COLUMN retry_count INTEGER DEFAULT 0`,