feat(favorites): implement user favorites and recents functionality

Introduced a new API client for managing user favorites, allowing users to list, add, and remove starred resources. Enhanced the sidebar to display favorites and recents, improving user navigation. Updated internationalization files to include relevant labels and tooltips for the new features across multiple languages.

Refs: #1303

migrations/sqlite/000000_init.up.sql

@@ -299,6 +299,22 @@ CREATE INDEX IF NOT EXISTS idx_audit_logs_tenant_action
 CREATE INDEX IF NOT EXISTS idx_audit_logs_created_at
     ON audit_logs(created_at);
 
+-- user_resource_favorites — sqlite mirror of migration 000047. Same
+-- composite PK (user_id, tenant_id, resource_type, resource_id) so the
+-- GORM model and FirstOrCreate idempotency carry over.
+CREATE TABLE IF NOT EXISTS user_resource_favorites (
+    user_id VARCHAR(36) NOT NULL,
+    tenant_id INTEGER NOT NULL,
+    resource_type VARCHAR(16) NOT NULL,
+    resource_id VARCHAR(64) NOT NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (user_id, tenant_id, resource_type, resource_id)
+);
+CREATE INDEX IF NOT EXISTS idx_user_resource_favorites_user_tenant_type_created_at
+    ON user_resource_favorites(user_id, tenant_id, resource_type, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_user_resource_favorites_tenant_id
+    ON user_resource_favorites(tenant_id);
+
 CREATE TABLE IF NOT EXISTS knowledge_tags (
     id VARCHAR(36) PRIMARY KEY,
     tenant_id INTEGER NOT NULL,