feat(s2a): Add S2A configuration profiles management system

- Add new `/api/s2a/profiles` endpoint supporting GET, POST, DELETE operations
- Create `s2a_profiles` database table with fields for API configuration, concurrency, priority, group IDs, and proxy settings
- Implement database methods: `GetS2AProfiles()`, `AddS2AProfile()`, `DeleteS2AProfile()`
- Add S2AProfile struct to database models with JSON serialization support
- Implement profile management UI in S2AConfig page with save, load, and delete functionality
- Add profile list display with ability to apply saved configurations
- Add S2AProfile type definition to frontend types
- Enable users to save and reuse S2A configurations as presets for faster setup

backend/internal/database/sqlite.go

@@ -23,6 +23,20 @@ type TeamOwner struct {
 	LastCheckedAt *time.Time `json:"last_checked_at,omitempty"`
 }
 
+// S2AProfile S2A 配置预设
+type S2AProfile struct {
+	ID           int64     `json:"id"`
+	Name         string    `json:"name"`
+	APIBase      string    `json:"api_base"`
+	AdminKey     string    `json:"admin_key"`
+	Concurrency  int       `json:"concurrency"`
+	Priority     int       `json:"priority"`
+	GroupIDs     string    `json:"group_ids"` // JSON array string
+	ProxyEnabled bool      `json:"proxy_enabled"`
+	ProxyAddress string    `json:"proxy_address"`
+	CreatedAt    time.Time `json:"created_at"`
+}
+
 // DB 数据库管理器
 type DB struct {
 	db *sql.DB
@@ -161,6 +175,20 @@ func (d *DB) createTables() error {
 		CREATE INDEX IF NOT EXISTS idx_app_logs_timestamp ON app_logs(timestamp);
 		CREATE INDEX IF NOT EXISTS idx_app_logs_module ON app_logs(module);
 		CREATE INDEX IF NOT EXISTS idx_app_logs_level ON app_logs(level);
+
+		-- S2A 配置预设表
+		CREATE TABLE IF NOT EXISTS s2a_profiles (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			name TEXT NOT NULL,
+			api_base TEXT NOT NULL,
+			admin_key TEXT NOT NULL,
+			concurrency INTEGER DEFAULT 2,
+			priority INTEGER DEFAULT 0,
+			group_ids TEXT,
+			proxy_enabled INTEGER DEFAULT 0,
+			proxy_address TEXT,
+			created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+		);
 	`)
 	return err
 }
@@ -1260,3 +1288,51 @@ func (d *DB) Close() error {
 	}
 	return nil
 }
+
+// GetS2AProfiles 获取所有 S2A 配置预设
+func (d *DB) GetS2AProfiles() ([]S2AProfile, error) {
+	rows, err := d.db.Query(`
+		SELECT id, name, api_base, admin_key, concurrency, priority, group_ids, proxy_enabled, proxy_address, created_at
+		FROM s2a_profiles
+		ORDER BY created_at DESC
+	`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var profiles []S2AProfile
+	for rows.Next() {
+		var p S2AProfile
+		var proxyEnabled int
+		err := rows.Scan(&p.ID, &p.Name, &p.APIBase, &p.AdminKey, &p.Concurrency, &p.Priority, &p.GroupIDs, &proxyEnabled, &p.ProxyAddress, &p.CreatedAt)
+		if err != nil {
+			continue
+		}
+		p.ProxyEnabled = proxyEnabled == 1
+		profiles = append(profiles, p)
+	}
+	return profiles, nil
+}
+
+// AddS2AProfile 添加 S2A 配置预设
+func (d *DB) AddS2AProfile(p S2AProfile) (int64, error) {
+	proxyEnabled := 0
+	if p.ProxyEnabled {
+		proxyEnabled = 1
+	}
+	result, err := d.db.Exec(`
+		INSERT INTO s2a_profiles (name, api_base, admin_key, concurrency, priority, group_ids, proxy_enabled, proxy_address, created_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)
+	`, p.Name, p.APIBase, p.AdminKey, p.Concurrency, p.Priority, p.GroupIDs, proxyEnabled, p.ProxyAddress)
+	if err != nil {
+		return 0, err
+	}
+	return result.LastInsertId()
+}
+
+// DeleteS2AProfile 删除 S2A 配置预设
+func (d *DB) DeleteS2AProfile(id int64) error {
+	_, err := d.db.Exec("DELETE FROM s2a_profiles WHERE id = ?", id)
+	return err
+}