fix(ai-moderation): implement prompt analysis recommendations

- Expand IMPHNEN domain rule to cover wildcard (*.imphnen.*)
- Trim redundant SARA examples from TEXT_ONLY_MODE (save ~950 tokens)
- Add debugging logs for channel culture injection into prompt
- Sync flag validation set with missing flags: potential_evasion, unclear_context

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

package.json

@@ -18,6 +18,7 @@
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate",
     "db:studio": "drizzle-kit studio",
+    "db:truncate": "psql \"$DATABASE_URL\" -f scripts/truncate-all.sql",
     "install:yt-dlp": "sh scripts/install-yt-dlp.sh"
   },
   "devDependencies": {