build: 打通 FastAPI 与 Vue 最小工程、依赖与数据库连接

后端入口、配置、Redis 与 Alembic 迁移就位；前端 Vite 工程可安装可构建。

backend/app/core/edition.py

@@ -0,0 +1,54 @@
+"""
+Copyright 2024-2026 ReplyPier
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+# NO_ENTERPRISE=1 runs the backend as the community edition even when the
+# enterprise submodule is checked out.
+#
+# CI and self-hosted builds have app/enterprise empty, so every
+# `try: import app.enterprise` falls back to community mode. A developer
+# checkout has the submodule populated, which switches on plan and
+# subscription gating. Setting this makes the import fail the same way, so the
+# unit suite (`NO_ENTERPRISE=1 python -m pytest tests/`) and the e2e OSS stack
+# behave exactly like a community install.
+#
+# An env var rather than a flag because the blocker must be installed before
+# anything imports app.enterprise — app/__init__.py calls apply() first thing.
+
+import os
+import sys
+
+
+class _BlockEnterprise:
+    """Meta-path finder that makes app.enterprise look un-checked-out."""
+
+    def find_spec(self, fullname, path=None, target=None):
+        if fullname == "app.enterprise" or fullname.startswith("app.enterprise."):
+            # ModuleNotFoundError, not bare ImportError: that is what an
+            # un-checked-out submodule actually raises, and it is what
+            # pytest.importorskip and the app's own guards look for.
+            raise ModuleNotFoundError(
+                f"No module named {fullname!r} (disabled by NO_ENTERPRISE=1)",
+                name=fullname,
+            )
+        return None
+
+
+def apply() -> None:
+    """Install the enterprise blocker when NO_ENTERPRISE=1 (idempotent)."""
+    if os.getenv("NO_ENTERPRISE") != "1":
+        return
+    if not any(isinstance(finder, _BlockEnterprise) for finder in sys.meta_path):
+        sys.meta_path.insert(0, _BlockEnterprise())