core: migrate from custom JSON storage to standard Drizzle migrations to improve database reliability and performance

This replaces the previous manual JSON file system with standard Drizzle migrations, enabling:
- Proper database schema migrations with timestamp-based versioning
- Batched migration for faster migration of large datasets
- Better data integrity with proper table schemas instead of JSON blobs
- Easier database upgrades and rollback capabilities

Migration changes:
- Todo table now uses individual columns with composite PK instead of JSON blob
- Share table removes unused download share data
- Session diff table moved from database table to file storage
- All migrations now use proper Drizzle format with per-folder layout

Users will see a one-time migration on next run that migrates existing JSON data to the new SQLite database.

packages/console/core/package.json

@@ -12,7 +12,7 @@
     "@opencode-ai/console-resource": "workspace:*",
     "@planetscale/database": "1.19.0",
     "aws4fetch": "1.0.20",
-    "drizzle-orm": "0.41.0",
+    "drizzle-orm": "catalog:",
     "postgres": "3.4.7",
     "stripe": "18.0.0",
     "ulid": "catalog:",
@@ -43,7 +43,7 @@
     "@tsconfig/node22": "22.0.2",
     "@types/bun": "1.3.0",
     "@types/node": "catalog:",
-    "drizzle-kit": "0.30.5",
+    "drizzle-kit": "catalog:",
     "mysql2": "3.14.4",
     "typescript": "catalog:",
     "@typescript/native-preview": "catalog:"