fix: resolve architecture disconnects and codebase weaknesses

- Standardize MessageRecord types — single source of truth from @bete/shared
- Clean up config: remove unused GUILD_ID/TEXT_GUILD_ID/TEXT_CHANNEL_ID, fix WEBSERVER_PORT default (3001), remove default admin password
- Move mascot_chat_messages table to Drizzle schema with proper migration
- Remove runtime DDL (CREATE TABLE IF NOT EXISTS) from mascot-chat repository
- Remove phantom analytics/ module from documentation
- Add better-sqlite3 dependency to root devDependencies
- Replace 'as any' casts with proper type assertions across AI moderation
- Add error logging to silent catch blocks in LLM client
- Apply Biome formatting and import organization

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

services/discord-gateway/drizzle/migrations/0007_mascot_chat_table.sql

@@ -0,0 +1,12 @@
+-- Move mascot_chat_messages from runtime CREATE TABLE to Drizzle migration
+-- Previously created at runtime by mascot-chat.repository.ts ensureSchema()
+CREATE TABLE IF NOT EXISTS "mascot_chat_messages" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"user_id" text NOT NULL,
+	"user_message" text NOT NULL,
+	"mascot_response" text NOT NULL,
+	"context" jsonb DEFAULT '{}' NOT NULL,
+	"created_at" timestamptz DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "idx_mascot_chat_messages_user_created" ON "mascot_chat_messages" USING btree ("user_id", "created_at" DESC);

services/discord-gateway/drizzle/migrations/meta/_journal.json

@@ -50,6 +50,13 @@
       "when": 1780900000000,
       "tag": "0006_replace_base64_with_image_url",
       "breakpoints": true
+    },
+    {
+      "idx": 7,
+      "version": "7",
+      "when": 1781174400000,
+      "tag": "0007_mascot_chat_table",
+      "breakpoints": true
     }
   ]
 }