refactor(frpc): restructure instance management and config handling

- Move instance-related structs and functions to config.go
- Remove serverAddr, serverPort, and authMethod from database schema
- Implement new config parsing and encoding with nested key support
- Update service management to use instanceID instead of username/name
- Add GetServiceNameByInstanceID helper function
- Update API documentation for auth.method field change

frpcProxyAct.go

@@ -7,17 +7,11 @@ import (
 	"net/http"
 	"os"
 	"strconv"
-	"strings"
 	"super-frpc/postLog"
 
 	"github.com/BurntSushi/toml"
 )
 
-type CreateProxyRequest struct {
-	InstanceID string        `json:"instanceID"`
-	ProxyInfo  FrpcProxyInfo `json:"proxyInfo"`
-}
-
 func CreateProxyHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
 		SendErrorResponse(w, http.StatusMethodNotAllowed, "Invalid request method")
@@ -129,30 +123,6 @@ func CreateProxyHandler(w http.ResponseWriter, r *http.Request) {
 	postLog.Info(fmt.Sprintf("[CreateProxyHandler] Proxy %s created successfully for instance %d", proxyInfo.Name, instance.ID))
 }
 
-func addFrpcProxy(configContent string, info FrpcProxyInfo) (string, error) {
-	var config FrpcConfig
-	if _, err := toml.Decode(configContent, &config); err != nil {
-		return "", fmt.Errorf("failed to parse config: %w", err)
-	}
-
-	proxy := map[string]interface{}{
-		"name":       info.Name,
-		"type":       info.Type,
-		"localIP":    info.LocalIP,
-		"localPort":  info.LocalPort,
-		"remotePort": info.RemotePort,
-	}
-
-	config.Proxies = append(config.Proxies, proxy)
-
-	var buf strings.Builder
-	if err := toml.NewEncoder(&buf).Encode(config); err != nil {
-		return "", fmt.Errorf("failed to write config: %w", err)
-	}
-
-	return buf.String(), nil
-}
-
 func DeleteProxyHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
 		SendErrorResponse(w, http.StatusMethodNotAllowed, "Invalid request method")
@@ -249,36 +219,6 @@ func DeleteProxyHandler(w http.ResponseWriter, r *http.Request) {
 	postLog.Info(fmt.Sprintf("[DeleteProxyHandler] Proxy %s deleted successfully from instance %d", proxyName, instance.ID))
 }
 
-func removeFrpcProxy(configContent string, proxyName string) (string, error) {
-	var config FrpcConfig
-	if _, err := toml.Decode(configContent, &config); err != nil {
-		return "", fmt.Errorf("failed to parse config: %w", err)
-	}
-
-	var found bool
-	var newProxies []map[string]interface{}
-	for _, proxy := range config.Proxies {
-		if name, ok := proxy["name"].(string); ok && name == proxyName {
-			found = true
-			continue
-		}
-		newProxies = append(newProxies, proxy)
-	}
-
-	if !found {
-		return "", fmt.Errorf("proxy %s not found", proxyName)
-	}
-
-	config.Proxies = newProxies
-
-	var buf strings.Builder
-	if err := toml.NewEncoder(&buf).Encode(config); err != nil {
-		return "", fmt.Errorf("failed to write config: %w", err)
-	}
-
-	return buf.String(), nil
-}
-
 func ListProxiesHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodGet {
 		SendErrorResponse(w, http.StatusMethodNotAllowed, "Invalid request method")