Add backend/frontend scaffolding with Oracle ADB wallet config

- Backend: Spring Boot 3 + WebFlux, JWT auth, Oracle ADB wallet,
  8 controllers/services/repositories (Auth~Tag), DTOs, exception handling
- Frontend: Next.js 15, TypeScript, Tailwind CSS, AuthContext,
  7 pages (dashboard, knowledge, chat, study, todos, habits, login)
- DB: V1 migration with 12 tables including VECTOR(1024) + HNSW index
- Ops: PM2 ecosystem config, deploy.sh, start-backend.sh
- CLAUDE.md: DB credentials replaced with env var references

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

sundol-frontend/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "sundol-frontend",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "next": "^15.3.1",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "axios": "^1.7.9",
+    "zustand": "^5.0.3",
+    "react-markdown": "^9.0.3",
+    "lucide-react": "^0.469.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.3",
+    "@types/node": "^22.10.0",
+    "@types/react": "^19.1.0",
+    "@types/react-dom": "^19.1.0",
+    "@tailwindcss/postcss": "^4.1.0",
+    "tailwindcss": "^4.1.0",
+    "eslint": "^9.17.0",
+    "eslint-config-next": "^15.3.1",
+    "@eslint/eslintrc": "^3"
+  }
+}