Fix TypeScript compilation issues in packages

- Add explicit type annotations for isolatedDeclarations
- Export Database type alias from db-schema
- Fix import paths and add proper type exports
- Update common schemas with better exports

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/db/src/index.ts

@@ -4,8 +4,8 @@
  * @module @reviq/db
  */
 
-import type { Kysely } from "kysely";
 import type { Database } from "@reviq/db-schema";
+import type { Kysely } from "kysely";
 import { createDb } from "./client.js";
 
 /**
@@ -15,12 +15,11 @@ import { createDb } from "./client.js";
  */
 export const db: Kysely<Database> = createDb();
 
-/**
- * Export createDb for creating custom database instances
- */
-export { createDb } from "./client.js";
-
 /**
  * Re-export database types from db-schema
  */
 export type { Database } from "@reviq/db-schema";
+/**
+ * Export createDb for creating custom database instances
+ */
+export { createDb } from "./client.js";