fix: switch GMW AI source from omniroute to 9router (model alias revert)

- Switch AI_LLM_BASE_URL from omniroute.imrnes.team to 9router.asepharyana.my.id
- Keep AI_LLM_MODEL as 'text' (9router uses alias-based routing, not bare names)
- Update .env.example comments to document 9router
- Per user: multimodal stays 'multimodal' alias

API verified: curl to 9router/v1/chat/completions with model 'text'
returns HTTP 200 (OpenAI-compatible format)

.env.example

@@ -86,7 +86,7 @@ BACKLOG_SYNC_BATCH_SIZE=100             # Messages per backlog batch, max 100 (d
 AI_ANALYSIS_ENABLED=false               # Enable AI content moderation (default: false)
 AI_LLM_API_KEY=                        # REQUIRED if AI_ANALYSIS_ENABLED=true. LLM API key
 AI_LLM_BASE_URL=https://9router.asepharyana.my.id/v1  # LLM API base URL (9router — OpenAI-compatible router, replaces omniroute)
-AI_LLM_MODEL=claude-opus-5                   # LLM text model name (default: claude-opus-5)
+AI_LLM_MODEL=text                       # LLM text model name (default: text)
 # AI_LLM_VISION_MODEL=                   # Vision model for image analysis (falls back to AI_LLM_MODEL)
 # AI_LLM_EMBEDDING_MODEL=                # Embedding model for semantic moderation cache (optional; enables near-duplicate text reuse to save LLM calls)
 # AI_LLM_EMBEDDING_MIN_SIMILARITY=0.97   # Min cosine similarity to reuse a cached verdict (default: 0.97)

services/discord-gateway/src/shared/config/index.ts

@@ -150,7 +150,7 @@ export const configSchema = z
       .string()
       .url()
       .default("https://9router.asepharyana.my.id/v1"),
-    AI_LLM_MODEL: z.string().default("claude-opus-5"),
+    AI_LLM_MODEL: z.string().default("text"),
     // Vision uses the SAME router/base URL as text moderation
     // (AI_LLM_BASE_URL) but a different model alias. The dedicated NVIDIA
     // multimodal endpoint was removed.