feat(frontend): add Helm chart browser, monitoring, chart-references and values templates pages

Add new frontend pages for the multi-tenant OCDP platform:

- Charts page (/charts): Browse Harbor OCI registries to list Helm chart repositories
  and versions, with deploy modal to launch charts on selected clusters
- Monitoring page (/monitoring): Display cluster metrics (CPU/Memory/GPU usage)
  and per-node details with resource utilization bars
- Chart References page (/chart-references): CRUD for chart metadata references
- Values Templates page (/templates): CRUD for Helm values templates with version
  history and rollback support
- Sidebar: Add Charts navigation, update Storage and Templates links
- api.ts: Add all API client functions (clusterApi, registryApi, instanceApi,
  monitoringApi, storageApi, chartReferenceApi, valuesTemplateApi,
  workspaceApi, userApi) with full TypeScript types

Note: deploy flow and values template rollback not yet end-to-end tested.

backend/scripts/init-db.sql

@@ -6,7 +6,11 @@ CREATE TABLE IF NOT EXISTS users (
     id VARCHAR(36) PRIMARY KEY,
     username VARCHAR(255) NOT NULL UNIQUE,
     password_hash TEXT NOT NULL,
-    email VARCHAR(255) NOT NULL,
+    email VARCHAR(255),
+    role VARCHAR(20) NOT NULL DEFAULT 'user',
+    workspace_id VARCHAR(36),
+    is_active BOOLEAN DEFAULT TRUE,
+    must_change_password BOOLEAN DEFAULT FALSE,
     revoked_after TIMESTAMP NOT NULL DEFAULT '1970-01-01 00:00:00',
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
@@ -24,15 +28,21 @@ COMMENT ON COLUMN users.email IS '邮箱';
 -- ===== Clusters 表 =====
 CREATE TABLE IF NOT EXISTS clusters (
     id VARCHAR(36) PRIMARY KEY,
-    name VARCHAR(255) NOT NULL UNIQUE,
+    workspace_id VARCHAR(36),
+    owner_id VARCHAR(36),
+    name VARCHAR(255) NOT NULL,
     host TEXT NOT NULL,
     ca_data TEXT,
     cert_data TEXT,
     key_data TEXT,
     token TEXT,
     description TEXT,
+    isolation_mode VARCHAR(20) DEFAULT 'namespace',
+    default_namespace VARCHAR(255),
+    is_shared BOOLEAN DEFAULT FALSE,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(workspace_id, name)
 );
 
 CREATE INDEX IF NOT EXISTS idx_clusters_name ON clusters(name);
@@ -116,6 +126,69 @@ COMMENT ON COLUMN instances.last_operation IS '最后一次操作类型';
 COMMENT ON COLUMN instances.last_error IS '最近一次错误信息';
 COMMENT ON COLUMN instances.revision IS 'Helm Release Revision';
 
+-- ===== Workspaces 表 =====
+CREATE TABLE IF NOT EXISTS workspaces (
+    id VARCHAR(36) PRIMARY KEY,
+    name VARCHAR(255) NOT NULL UNIQUE,
+    description TEXT,
+    created_by VARCHAR(36),
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_workspaces_name ON workspaces(name);
+
+-- ===== Storage Backends 表 =====
+CREATE TABLE IF NOT EXISTS storage_backends (
+    id VARCHAR(36) PRIMARY KEY,
+    workspace_id VARCHAR(36),
+    name VARCHAR(255) NOT NULL,
+    type VARCHAR(50) NOT NULL,
+    config JSONB NOT NULL,
+    description TEXT,
+    is_default BOOLEAN DEFAULT FALSE,
+    is_shared BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(workspace_id, name)
+);
+
+CREATE INDEX IF NOT EXISTS idx_storage_workspace ON storage_backends(workspace_id);
+
+-- ===== Chart References 表 =====
+CREATE TABLE IF NOT EXISTS chart_references (
+    id VARCHAR(36) PRIMARY KEY,
+    workspace_id VARCHAR(36),
+    registry_id VARCHAR(36),
+    repository VARCHAR(500) NOT NULL,
+    chart_name VARCHAR(255) NOT NULL,
+    description TEXT,
+    is_enabled BOOLEAN DEFAULT TRUE,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_chart_workspace ON chart_references(workspace_id);
+CREATE INDEX IF NOT EXISTS idx_chart_registry ON chart_references(registry_id);
+
+-- ===== Values Templates 表 =====
+CREATE TABLE IF NOT EXISTS values_templates (
+    id VARCHAR(36) PRIMARY KEY,
+    workspace_id VARCHAR(36),
+    chart_reference_id VARCHAR(36),
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+    values_yaml TEXT NOT NULL,
+    version INTEGER NOT NULL DEFAULT 1,
+    is_default BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(workspace_id, chart_reference_id, name)
+);
+
+CREATE INDEX IF NOT EXISTS idx_values_template_chart ON values_templates(chart_reference_id);
+CREATE INDEX IF NOT EXISTS idx_values_template_workspace ON values_templates(workspace_id);
+
 -- ===== 数据库版本表 =====
 CREATE TABLE IF NOT EXISTS schema_migrations (
     version VARCHAR(50) PRIMARY KEY,