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-key-naming.md

@@ -0,0 +1,62 @@
+---
+title: Use Consistent Key Naming Conventions
+impact: MEDIUM
+impactDescription: Improved maintainability and debugging
+tags: keys, naming, conventions, prefixes
+description: Use Consistent Key Naming Conventions
+alwaysApply: true
+---
+
+## Use Consistent Key Naming Conventions
+
+Well-structured key names improve code maintainability, debugging, and enable efficient key scanning.
+
+**Correct:** Use colons as separators with a consistent hierarchy.
+
+```
+# Pattern: service:entity:id:attribute
+user:1001:profile
+user:1001:settings
+order:2024:items
+cache:api:users:list
+session:abc123
+```
+
+**Python** (redis-py):
+```python
+# Good: Short, meaningful key
+redis.set("product:8361", cached_html)
+page = redis.get("product:8361")
+```
+
+**Java** (Jedis):
+```java
+// Good: Short, meaningful key derived from URL
+jedis.set("product:8361", "<some cached HTML>");
+String page = jedis.get("product:8361");
+```
+
+**Incorrect:** Inconsistent naming, spaces, or very long keys.
+
+```
+# These cause confusion and waste memory
+User_1001_Profile
+my key with spaces
+com.mycompany.myapp.production.users.profile.data.1001
+```
+
+**Java** (Jedis):
+```java
+// Bad: Using full URL as key wastes memory and slows comparisons
+jedis.set("http://www.verylongurlkey.com/store/products/product.html?id=8361",
+          "<some cached HTML>");
+```
+
+**Key naming tips:**
+- Keep keys short but readable—they consume memory
+- Consider key prefixes for multi-tenant applications
+- Extract short identifiers from URLs or long strings rather than using the whole thing
+- For large binary values, consider using a hash digest as the key instead of the value itself
+- Use consistent separators (colons are conventional)
+
+Reference: [Redis Keys](https://redis.io/docs/latest/develop/use/keyspace/)