init: web portal

backend/init.sql

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+CREATE TABLE IF NOT EXISTS users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(100) UNIQUE NOT NULL,
+    password_hash TEXT NOT NULL,
+    is_admin BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS webpages (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(200) NOT NULL,
+    url TEXT NOT NULL,
+    description TEXT DEFAULT '',
+    icon VARCHAR(10) DEFAULT '🌐',
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS user_webpages (
+    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
+    webpage_id INTEGER REFERENCES webpages(id) ON DELETE CASCADE,
+    PRIMARY KEY (user_id, webpage_id)
+);
+
+-- Default admin account (password: admin1234)
+INSERT INTO users (username, password_hash, is_admin)
+VALUES ('admin', '$2b$12$LQv3c1yqBWVHxkd0LHAkCOYz6TtxMQJqhN8/LewKyNiAYMxRmfvym', TRUE)
+ON CONFLICT (username) DO NOTHING;
+
+-- Default test user (password: user1234)
+INSERT INTO users (username, password_hash, is_admin)
+VALUES ('user1', '$2b$12$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', FALSE)
+ON CONFLICT (username) DO NOTHING;
+
+-- Sample webpages
+INSERT INTO webpages (name, url, description, icon) VALUES
+('Google', 'https://www.google.com', '구글 검색 엔진', '🔍'),
+('GitHub', 'https://github.com', '소스코드 저장소', '🐙'),
+('Kubernetes Dashboard', 'http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/', '쿠버네티스 대시보드', '☸️'),
+('Grafana', 'http://grafana.monitoring.svc:3000', '모니터링 대시보드', '📊'),
+('Notion', 'https://notion.so', '문서 협업 툴', '📝')
+ON CONFLICT DO NOTHING;