feat(core-edu): 完整实现 core-edu 教学核心服务

包含 classes/exams/homework/grades/attendance/scheduling 域、outbox、iam-consumer、redis 配置等完整实现

packages/shared-proto/buf.gen.yaml

@@ -5,4 +5,15 @@ plugins:
   - remote: buf.build/protocolbuffers/js
     out: ../shared-ts/gen/proto
   - remote: buf.build/protocolbuffers/python
-    out: ../shared-py/gen/proto
+    out: ../shared-py/gen/proto
+  # gRPC plugins (president-final-rulings §2.5 / batch 0.9)
+  - remote: buf.build/grpc/go
+    out: ../shared-go/gen/proto
+    opt:
+      - paths=source_relative
+  - remote: buf.build/grpc/node
+    out: ../shared-ts/gen/proto
+    opt:
+      - grpc_js
+  - remote: buf.build/grpc/python
+    out: ../shared-py/gen/proto