Migrate frontend to Vite + Hono CopilotKit runtime

Replaces the Next.js scaffold with a Vite SPA paired with a Hono
sidecar that hosts the CopilotKit runtime and proxies AG-UI traffic
to the MAF backend. Adds dev/prod Dockerfile, .dockerignore,
.gitignore, pnpm workspace config, and updates entrypoints
(main.tsx / App.tsx / index.css / index.html) plus the service
worker accordingly.

Server middleware reconciles MAF MESSAGES_SNAPSHOT id mismatches
so post-tool-call assistant text doesn't render twice, suppresses
duplicate text emitted alongside render tools, and strips OpenAI
training-token leaks from streamed deltas.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/tsconfig.json

@@ -7,17 +7,15 @@
     "skipLibCheck": true,
     "moduleResolution": "bundler",
     "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
     "isolatedModules": true,
-    "moduleDetection": "force",
     "noEmit": true,
     "jsx": "react-jsx",
     "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "noFallthroughCasesInSwitch": true,
     "paths": {
       "@/*": ["./src/*"]
     }
   },
-  "include": ["src"]
+  "include": ["src", "server.ts"],
+  "exclude": ["node_modules"]
 }