refactor: simplify AI moderation pipeline to Primary AI only, fix stickerCache executeGet

- Remove Groq and NVIDIA fallback from text moderation pipeline
- Remove GROQ_API_KEY, GROQ_MODERATION_*, NVIDIA_NEMOTRON_* config vars
- Update source enum: remove 'groq' and 'nvidia' from cache/schema types
- Rewrite indonesianTextNormalizer to use Primary AI only (no fallback chain)
- Rewrite remote test to test Primary AI only
- Fix stickerCache executeGet missing empty params array

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/moderation/stickerCache.ts

@@ -33,6 +33,7 @@ export async function initStickerCache(): Promise<void> {
     );
     const row = await executeGet(
       "SELECT count(*) as cnt, COALESCE(SUM(size), 0) as total FROM sticker_cache",
+      [],
     );
     if (row) {
       statsCache = {