refactor: large codebase cleanup - consolidate schemas, migrate to Drizzle ORM, extract frontend components, modernize Docker builds

- Consolidate all DB schema definitions into packages/shared as single source of truth
- Migrate backend from raw SQL to Drizzle ORM across all modules
- Extract frontend inline UI into separate component files
- Refactor discord-gateway circuitBreaker into conversationState + moderationState
- Convert messageStore to Proxy singleton pattern
- Add validateBody/validateQuery middleware + Zod schemas for API endpoints
- Modernize Docker builds with multi-stage + pnpm deploy
- Migrate CI/CD from deployment to image-based pipeline
- Remove 60+ unused/dead files (~15K lines)
- Update color scheme from sky-blue to teal-cyan
- Move DB connection management to @bete/shared/database

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

services/frontend/src/lib/navigation.ts

@@ -1,5 +1,4 @@
 import {
-  BarChart3,
   Headphones,
   LayoutDashboard,
   type LucideIcon,
@@ -7,6 +6,7 @@ import {
   Mic,
   Music,
   Search,
+  Settings,
 } from "lucide-react";
 
 export interface NavItem {
@@ -60,7 +60,7 @@ export const navItems: NavItem[] = [
   {
     href: "/settings",
     label: "Settings",
-    icon: BarChart3,
+    icon: Settings,
     matchPrefix: "/settings",
   },
 ];
@@ -73,3 +73,8 @@ export const mobileNavItems: NavItem[] = navItems.filter((item) =>
 );
 
 export type NavItemId = (typeof navItems)[number]["href"];
+
+export function isActivePath(pathname: string, matchPrefix: string): boolean {
+  if (matchPrefix === "/dashboard") return pathname === "/dashboard";
+  return pathname.startsWith(matchPrefix);
+}