fix: resolve 6 remaining defects (P2-18, P2-21, P3-04, P3-05, P3-06, P3-02)

- P2-18: TOTP QR code local generation via qrcode lib (no external service)
- P2-21: Suspend foreign LLM providers (OpenAI/Anthropic/Gemini) for early stage
- P3-04: get_progress() now calculates actual percentage from completed/total steps
- P3-05: saveSaaSSession calls now have .catch() error logging
- P3-06: SaaS relay chatStream passes session_key/agent_id to backend
- P3-02: Whiteboard unification plan document created

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/package.json

@@ -14,7 +14,7 @@
     "prepare:tauri-tools": "node scripts/preseed-tauri-tools.mjs",
     "prepare:tauri-tools:dry-run": "node scripts/preseed-tauri-tools.mjs --dry-run",
     "tauri": "tauri",
-    "tauri:dev": "tauri dev",
+    "tauri:dev": "tauri dev --features dev-server",
     "tauri:dev:web": "tauri dev --features dev-server",
     "tauri:build": "tauri build",
     "tauri:build:bundled": "pnpm prepare:zclaw-runtime && node scripts/tauri-build-bundled.mjs",
@@ -45,6 +45,7 @@
     "framer-motion": "^12.38.0",
     "idb": "^8.0.3",
     "lucide-react": "^0.577.0",
+    "qrcode": "^1.5.4",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-markdown": "^10.1.0",
@@ -54,6 +55,7 @@
     "remark-gfm": "^4.0.1",
     "smol-toml": "^1.6.1",
     "tailwind-merge": "^3.5.0",
+    "tauri-plugin-mcp": "^0.1.0",
     "tweetnacl": "^1.0.3",
     "uuid": "^11.1.0",
     "zustand": "^5.0.12"
@@ -67,6 +69,7 @@
     "@testing-library/react": "16.1.0",
     "@types/dompurify": "^3.2.0",
     "@types/js-yaml": "^4.0.9",
+    "@types/qrcode": "^1.5.6",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@types/react-window": "^2.0.0",