refactor(api): restructured API for type safety, maintainability and docs generation

- These changes makes the API incombatible with previous versions
- Added new types for error handling, success responses, and health checks.
- Updated health check logic to utilize the new types for better clarity and structure.
- Refactored existing handlers to improve response consistency and error handling.
- Updated Makefile to include a new target for generating API types from Swagger.
- Updated "new agent" API to respond an encrypted cert pair

internal/types/stats.go

@@ -0,0 +1,50 @@
+package types
+
+import provider "github.com/yusing/go-proxy/internal/route/provider/types"
+
+type (
+	RouteStats struct {
+		Total        uint16 `json:"total"`
+		NumHealthy   uint16 `json:"healthy"`
+		NumUnhealthy uint16 `json:"unhealthy"`
+		NumNapping   uint16 `json:"napping"`
+		NumError     uint16 `json:"error"`
+		NumUnknown   uint16 `json:"unknown"`
+	} //	@name	RouteStats
+	ProviderStats struct {
+		Total   uint16        `json:"total"`
+		RPs     RouteStats    `json:"reverse_proxies"`
+		Streams RouteStats    `json:"streams"`
+		Type    provider.Type `json:"type"`
+	} //	@name	ProviderStats
+)
+
+func (stats *RouteStats) Add(r Route) {
+	stats.Total++
+	mon := r.HealthMonitor()
+	if mon == nil {
+		stats.NumUnknown++
+		return
+	}
+	switch mon.Status() {
+	case StatusHealthy:
+		stats.NumHealthy++
+	case StatusUnhealthy:
+		stats.NumUnhealthy++
+	case StatusNapping:
+		stats.NumNapping++
+	case StatusError:
+		stats.NumError++
+	default:
+		stats.NumUnknown++
+	}
+}
+
+func (stats *RouteStats) AddOther(other RouteStats) {
+	stats.Total += other.Total
+	stats.NumHealthy += other.NumHealthy
+	stats.NumUnhealthy += other.NumUnhealthy
+	stats.NumNapping += other.NumNapping
+	stats.NumError += other.NumError
+	stats.NumUnknown += other.NumUnknown
+}