refactor(api): TOML 配置 SSOT、统一错误契约、Auth/事务加固与可观测性 (#33)

配置 SSOT（TOML + .env）
统一错误契约
Auth 与事务边界
Redis / Celery 可靠性:业务 Redis（DB/0）与 Celery broker/backend（DB/1）显式拆分；连接池、sync client
可观测性（OpenTelemetry + LGTM）

api/.agents/skills/redis-development/rules/data-incr.md

@@ -0,0 +1,76 @@
+---
+title: Use INCR for Atomic Counters
+impact: MEDIUM
+impactDescription: Atomic increment avoids race conditions
+tags: incr, counters, atomic, performance
+description: Use INCR for Atomic Counters
+alwaysApply: true
+---
+
+## Use INCR for Atomic Counters
+
+If a string represents an integer value, use the `INCR` command to increment the number directly. The increment is atomic and always returns the new value. Use `INCRBY` to increment by any integer (positive or negative). This is more efficient and race-condition-free than reading, incrementing in code, and writing back.
+
+**Correct:** Use INCR/INCRBY for atomic counter updates.
+
+**Python** (redis-py):
+```python
+import redis
+
+client = redis.Redis(host='localhost', port=6379)
+
+# Initialize counter
+client.set("counter", "0")
+
+# Atomic increment - returns new value
+new_value = client.incr("counter")  # Returns 1
+
+# Increment by specific amount
+new_value = client.incrby("counter", 10)  # Returns 11
+```
+
+**Java** (Jedis):
+```java
+import redis.clients.jedis.UnifiedJedis;
+
+try (UnifiedJedis jedis = new UnifiedJedis("redis://localhost:6379")) {
+    jedis.set("counter", "0");
+    
+    // Atomic increment - returns new value
+    long newValue = jedis.incr("counter");  // Returns 1
+    
+    // Increment by specific amount
+    newValue = jedis.incrBy("counter", 10);  // Returns 11
+}
+```
+
+**Incorrect:** Read-modify-write pattern creates race conditions.
+
+**Python** (redis-py):
+```python
+import redis
+
+client = redis.Redis(host='localhost', port=6379)
+
+client.set("counter", "0")
+
+# BAD: Race condition - another client could modify between GET and SET
+curr_value = int(client.get("counter"))
+client.set("counter", str(curr_value + 1))  # Not atomic!
+```
+
+**Java** (Jedis):
+```java
+import redis.clients.jedis.UnifiedJedis;
+
+try (UnifiedJedis jedis = new UnifiedJedis("redis://localhost:6379")) {
+    jedis.set("counter", "0");
+    
+    // BAD: Race condition between GET and SET
+    long currValue = Long.parseLong(jedis.get("counter"));
+    jedis.set("counter", Long.toString(currValue + 1));  // Not atomic!
+}
+```
+
+Reference: [INCR command](https://redis.io/docs/latest/commands/incr/)
+