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/client.ts

@@ -4,8 +4,8 @@
  * @module @reviq/db
  */
 
-import { Kysely, PostgresDialect } from "kysely";
 import type { Database } from "@reviq/db-schema";
+import { Kysely, PostgresDialect } from "kysely";
 import pg from "pg";
 
 const { Pool } = pg;
@@ -17,11 +17,11 @@ const { Pool } = pg;
  * @returns Kysely database instance
  */
 export const createDb = (
-  connectionString: string = process.env.DATABASE_URL || ""
+  connectionString: string = process.env.DATABASE_URL || "",
 ): Kysely<Database> => {
   if (!connectionString) {
     throw new Error(
-      "Database connection string is required. Set DATABASE_URL environment variable."
+      "Database connection string is required. Set DATABASE_URL environment variable.",
     );
   }