add persistent proxy/visitor store with CRUD API and web UI (#5188)

pkg/config/source/base_source.go

@@ -0,0 +1,65 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package source
+
+import (
+	"sync"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+// baseSource provides shared state and behavior for Source implementations.
+// It manages proxy/visitor storage.
+// Concrete types (ConfigSource, StoreSource) embed this struct.
+type baseSource struct {
+	mu sync.RWMutex
+
+	proxies  map[string]v1.ProxyConfigurer
+	visitors map[string]v1.VisitorConfigurer
+}
+
+func newBaseSource() baseSource {
+	return baseSource{
+		proxies:  make(map[string]v1.ProxyConfigurer),
+		visitors: make(map[string]v1.VisitorConfigurer),
+	}
+}
+
+// Load returns all enabled proxy and visitor configurations.
+// Configurations with Enabled explicitly set to false are filtered out.
+func (s *baseSource) Load() ([]v1.ProxyConfigurer, []v1.VisitorConfigurer, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	proxies := make([]v1.ProxyConfigurer, 0, len(s.proxies))
+	for _, p := range s.proxies {
+		// Filter out disabled proxies (nil or true means enabled)
+		if enabled := p.GetBaseConfig().Enabled; enabled != nil && !*enabled {
+			continue
+		}
+		proxies = append(proxies, p)
+	}
+
+	visitors := make([]v1.VisitorConfigurer, 0, len(s.visitors))
+	for _, v := range s.visitors {
+		// Filter out disabled visitors (nil or true means enabled)
+		if enabled := v.GetBaseConfig().Enabled; enabled != nil && !*enabled {
+			continue
+		}
+		visitors = append(visitors, v)
+	}
+
+	return cloneConfigurers(proxies, visitors)
+}