feat: add forum and token store service skeletons

backend/cmd/taskclassforum/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"log"
+
+	"github.com/LoveLosita/smartflow/backend/bootstrap"
+	forumdao "github.com/LoveLosita/smartflow/backend/services/taskclassforum/dao"
+	forumrpc "github.com/LoveLosita/smartflow/backend/services/taskclassforum/rpc"
+	forumsv "github.com/LoveLosita/smartflow/backend/services/taskclassforum/sv"
+	"github.com/spf13/viper"
+)
+
+func main() {
+	if err := bootstrap.LoadConfig(); err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	db, err := forumdao.OpenDBFromConfig()
+	if err != nil {
+		log.Fatalf("failed to connect taskclassforum database: %v", err)
+	}
+
+	// 1. 当前阶段只启动计划广场自身 RPC 壳。
+	// 2. TaskClass legacy adapter 会在第三步业务主链路接入，避免现在抢改 task 模块。
+	// 3. 未实现的业务方法会明确返回 Unimplemented，而不是伪装成可用能力。
+	svc := forumsv.New(forumsv.Options{DB: db})
+	forumrpc.Start(forumrpc.ServerOptions{
+		ListenOn: viper.GetString("taskclassforum.rpc.listenOn"),
+		Timeout:  viper.GetDuration("taskclassforum.rpc.timeout"),
+		Service:  svc,
+	})
+}