Add FastAPI wechat app: config, wechat handler, run scripts, requirements, env template

run_local.py

@@ -0,0 +1,19 @@
+"""
+本地开发启动脚本
+
+使用方法:
+    python run_local.py
+
+或者直接用 uvicorn:
+    uvicorn wechat:app --reload --host 127.0.0.1 --port 8000
+"""
+
+import uvicorn
+
+if __name__ == "__main__":
+    uvicorn.run(
+        "wechat:app",
+        host="127.0.0.1",
+        port=8000,
+        reload=True,  # 代码改动自动重启，开发用
+    )