feat: billing layer v1.3.86 — PostgreSQL statistics

- internal/billing: Store interface + pgStore (pgx/v5 pool) + NoopStore
- factory.go: NewStore() from BILLING_DSN env var (NoopStore fallback)
- Server.billing: injected into Config, initialized in main
- handleInvokeFunction: record invocation (TriggerConsole)
- invokeInternalFunction: record invocation (TriggerHTTP)
- handleCreateFunction: record event_type=create
- handleCloneFunction: record event_type=clone
- handleDeleteFunction: record event_type=delete
- table: invocations (namespace, function_name, trigger_type, duration_ms, status_code...)
- BILLING_DSN added to console.yaml
- pgx/v5 added to go.mod/go.sum

console/internal/api/function_code.go

@@ -22,6 +22,7 @@ import (
 	"strings"
 	"time"
 
+	"fission-console/internal/billing"
 	"fission-console/internal/fission"
 	"fission-console/internal/model"
 	"fission-console/internal/runtime"
@@ -275,6 +276,16 @@ func (s *Server) handleCreateFunction(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	s.billing.RecordInvocation(billing.Invocation{
+		Namespace:    ns,
+		FunctionName: req.Name,
+		TriggerType:  billing.TriggerEvent,
+		StartedAt:    now,
+		StatusCode:   http.StatusCreated,
+		RecordedBy:   "console",
+		EventType:    "create",
+	})
+
 	writeAnyJSON(w, http.StatusCreated, map[string]any{
 		"name":        req.Name,
 		"package":     pkgName,