feat(grpc): add gRPC server infrastructure and schedule sync service

Add gRPC server support with configurable TLS, environment-based settings, and Wire injection. Implement schedule synchronization service with task runner integration for external course data fetching.

- Add gRPC configuration with env var overrides (APP_GRPC_ENABLED, APP_GRPC_PORT, etc.)
- Create gRPC server infrastructure with runner task management
- Implement ScheduleSyncService for course data synchronization
- Add sync endpoint to schedule handler for external system integration
- Update repository with context-aware batch delete operation
- Wire all dependencies including zap logger for structured logging

proto/runner/runner_grpc.pb.go

@@ -0,0 +1,145 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v6.33.1
+// source: proto/runner/runner.proto
+
+package runner
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+const (
+	RunnerHub_Connect_FullMethodName = "/runner.RunnerHub/Connect"
+)
+
+// RunnerHubClient is the client API for RunnerHub service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type RunnerHubClient interface {
+	// Connect 建立双向流连接
+	// Runner 通过此连接注册、接收任务、返回结果
+	Connect(ctx context.Context, opts ...grpc.CallOption) (RunnerHub_ConnectClient, error)
+}
+
+type runnerHubClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewRunnerHubClient(cc grpc.ClientConnInterface) RunnerHubClient {
+	return &runnerHubClient{cc}
+}
+
+func (c *runnerHubClient) Connect(ctx context.Context, opts ...grpc.CallOption) (RunnerHub_ConnectClient, error) {
+	stream, err := c.cc.NewStream(ctx, &RunnerHub_ServiceDesc.Streams[0], RunnerHub_Connect_FullMethodName, opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &runnerHubConnectClient{stream}
+	return x, nil
+}
+
+type RunnerHub_ConnectClient interface {
+	Send(*StreamMessage) error
+	Recv() (*StreamMessage, error)
+	grpc.ClientStream
+}
+
+type runnerHubConnectClient struct {
+	grpc.ClientStream
+}
+
+func (x *runnerHubConnectClient) Send(m *StreamMessage) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *runnerHubConnectClient) Recv() (*StreamMessage, error) {
+	m := new(StreamMessage)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// RunnerHubServer is the server API for RunnerHub service.
+// All implementations must embed UnimplementedRunnerHubServer
+// for forward compatibility
+type RunnerHubServer interface {
+	// Connect 建立双向流连接
+	// Runner 通过此连接注册、接收任务、返回结果
+	Connect(RunnerHub_ConnectServer) error
+	mustEmbedUnimplementedRunnerHubServer()
+}
+
+// UnimplementedRunnerHubServer must be embedded to have forward compatible implementations.
+type UnimplementedRunnerHubServer struct {
+}
+
+func (UnimplementedRunnerHubServer) Connect(RunnerHub_ConnectServer) error {
+	return status.Errorf(codes.Unimplemented, "method Connect not implemented")
+}
+func (UnimplementedRunnerHubServer) mustEmbedUnimplementedRunnerHubServer() {}
+
+// UnsafeRunnerHubServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to RunnerHubServer will
+// result in compilation errors.
+type UnsafeRunnerHubServer interface {
+	mustEmbedUnimplementedRunnerHubServer()
+}
+
+func RegisterRunnerHubServer(s grpc.ServiceRegistrar, srv RunnerHubServer) {
+	s.RegisterService(&RunnerHub_ServiceDesc, srv)
+}
+
+func _RunnerHub_Connect_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(RunnerHubServer).Connect(&runnerHubConnectServer{stream})
+}
+
+type RunnerHub_ConnectServer interface {
+	Send(*StreamMessage) error
+	Recv() (*StreamMessage, error)
+	grpc.ServerStream
+}
+
+type runnerHubConnectServer struct {
+	grpc.ServerStream
+}
+
+func (x *runnerHubConnectServer) Send(m *StreamMessage) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *runnerHubConnectServer) Recv() (*StreamMessage, error) {
+	m := new(StreamMessage)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// RunnerHub_ServiceDesc is the grpc.ServiceDesc for RunnerHub service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var RunnerHub_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "runner.RunnerHub",
+	HandlerType: (*RunnerHubServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "Connect",
+			Handler:       _RunnerHub_Connect_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "proto/runner/runner.proto",
+}