feat(TRUEREF-0009-0010): implement indexing pipeline job queue and public REST API

- SQLite-backed job queue with sequential processing and startup recovery
- Atomic snippet replacement in single transaction
- context7-compatible GET /api/v1/libs/search and GET /api/v1/context
- Token budget limiting and JSON/txt response format support
- CORS headers on all API routes via SvelteKit handle hook
- Library ID parser supporting /owner/repo and /owner/repo/version

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/server/api/library-id.ts

@@ -0,0 +1,32 @@
+/**
+ * Library ID parsing utilities.
+ *
+ * Parses the `libraryId` query parameter used by the context7-compatible API.
+ * Supports two formats:
+ *   - /owner/repo           (default branch)
+ *   - /owner/repo/version   (specific version tag)
+ */
+
+export interface ParsedLibraryId {
+	/** The canonical repository ID, e.g. "/facebook/react" */
+	repositoryId: string;
+	/** The version tag, e.g. "v18.3.0" — absent for default branch queries */
+	version?: string;
+}
+
+/**
+ * Parse a libraryId string into its constituent parts.
+ *
+ * @throws Error when the string does not match the expected pattern.
+ */
+export function parseLibraryId(libraryId: string): ParsedLibraryId {
+	const match = libraryId.match(/^(\/[^/]+\/[^/]+)(\/(.+))?$/);
+	if (!match) {
+		throw new Error(`Invalid libraryId: ${libraryId}`);
+	}
+
+	return {
+		repositoryId: match[1],
+		version: match[3]
+	};
+}