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/redis.py

@@ -0,0 +1,61 @@
+"""
+Copyright 2024-2026 ChatterMate
+
+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.
+"""
+
+import redis
+from app.core.config import settings
+from app.core.logger import get_logger
+
+logger = get_logger(__name__)
+
+redis_client = None
+
+def init_redis():
+    """Initialize Redis connection"""
+    global redis_client
+    
+    if not settings.REDIS_ENABLED:
+        logger.info("Redis is disabled")
+        return None
+        
+    redis_url = settings.REDIS_URL
+    if redis_url and redis_url.startswith("redis://") and ".cache.amazonaws.com" in redis_url:
+        redis_url = "rediss://" + redis_url[8:]
+        logger.info(f"Using TLS for Redis connection: {redis_url}")
+
+    try:
+        redis_client = redis.from_url(
+            redis_url,
+            socket_timeout=5.0,
+            socket_connect_timeout=5.0,
+            decode_responses=True  # Automatically decode responses to Python strings
+        )
+        
+        # Test connection immediately
+        redis_client.ping()
+        logger.info("Redis connection successful")
+        return redis_client
+    except Exception as e:
+        logger.error(f"Failed to initialize Redis client: {str(e)}")
+        return None
+
+def get_redis():
+    """Get Redis client instance"""
+    global redis_client
+    
+    if not redis_client and settings.REDIS_ENABLED:
+        redis_client = init_redis()
+    
+    return redis_client