Version: 0.9.73.dev.260505

后端：
1.阶段 5 course 服务边界落地
- 新增 cmd/course 独立进程入口，落地 services/course dao/rpc/sv
- 新增 gateway/client/course、shared/contracts/course 和 shared/ports course port
- 将 /api/v1/course/* HTTP 门面切到 course zrpc，gateway 只保留鉴权、限流、幂等、文件读取和响应透传
- 保留 course 迁移期直写 schedule_events / schedules 权限，维持课程导入两个表同事务写入语义
- 为 course parse-image 补 bytes RPC 契约和 gRPC 消息大小配置，兼容课表图片上传
- 补充 course.rpc 示例配置与阶段 5 文档基线、切流点、残留依赖和 smoke 记录

backend/services/course/rpc/pb/course.pb.go

@@ -0,0 +1,52 @@
+package pb
+
+import proto "github.com/golang/protobuf/proto"
+
+var _ = proto.Marshal
+
+const _ = proto.ProtoPackageIsVersion3
+
+type JSONRequest struct {
+	PayloadJson          []byte   `protobuf:"bytes,1,opt,name=payload_json,json=payloadJson,proto3" json:"payload_json,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *JSONRequest) Reset()         { *m = JSONRequest{} }
+func (m *JSONRequest) String() string { return proto.CompactTextString(m) }
+func (*JSONRequest) ProtoMessage()    {}
+
+type JSONResponse struct {
+	DataJson             []byte   `protobuf:"bytes,1,opt,name=data_json,json=dataJson,proto3" json:"data_json,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *JSONResponse) Reset()         { *m = JSONResponse{} }
+func (m *JSONResponse) String() string { return proto.CompactTextString(m) }
+func (*JSONResponse) ProtoMessage()    {}
+
+type CourseImageRequest struct {
+	Filename             string   `protobuf:"bytes,1,opt,name=filename,proto3" json:"filename,omitempty"`
+	MimeType             string   `protobuf:"bytes,2,opt,name=mime_type,json=mimeType,proto3" json:"mime_type,omitempty"`
+	ImageBytes           []byte   `protobuf:"bytes,3,opt,name=image_bytes,json=imageBytes,proto3" json:"image_bytes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CourseImageRequest) Reset()         { *m = CourseImageRequest{} }
+func (m *CourseImageRequest) String() string { return proto.CompactTextString(m) }
+func (*CourseImageRequest) ProtoMessage()    {}
+
+type StatusResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *StatusResponse) Reset()         { *m = StatusResponse{} }
+func (m *StatusResponse) String() string { return proto.CompactTextString(m) }
+func (*StatusResponse) ProtoMessage()    {}