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>

deploy.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+echo "=== SUNDOL Deploy ==="
+
+# Load env
+set -a
+source .env
+set +a
+
+# Build backend
+echo "[1/4] Building backend..."
+cd sundol-backend
+mvn package -q -DskipTests
+cd ..
+
+# Build frontend
+echo "[2/4] Building frontend..."
+cd sundol-frontend
+npm run build
+cd ..
+
+# Git push
+echo "[3/4] Pushing to git..."
+git add -A
+git commit -m "Deploy $(date +%Y%m%d-%H%M%S)" || true
+git push origin main
+
+# Restart PM2
+echo "[4/4] Restarting services..."
+pm2 restart ecosystem.config.cjs
+
+echo "=== Deploy complete ==="