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/rqe-index-creation.md

@@ -0,0 +1,73 @@
+---
+title: Index Only Fields You Query
+impact: HIGH
+impactDescription: Reduces index size and improves write performance
+tags: rqe, ft.create, index, schema
+description: Index Only Fields You Query
+alwaysApply: true
+---
+
+## Index Only Fields You Query
+
+Create indexes with only the fields you need to search, filter, or sort on.
+
+**Correct:** Index specific fields and use prefixes.
+
+```
+FT.CREATE idx:products ON HASH PREFIX 1 product:
+    SCHEMA
+        name TEXT WEIGHT 2.0
+        description TEXT
+        category TAG SORTABLE
+        price NUMERIC SORTABLE
+        location GEO
+```
+
+**Java** (Jedis):
+```java
+import redis.clients.jedis.search.*;
+
+Schema schema = new Schema()
+    .addTextField("name", 1)
+    .addTagField("categories");
+
+// Good: Specify prefix to index only matching keys
+IndexDefinition def = new IndexDefinition(IndexDefinition.Type.HASH)
+    .setPrefixes("person:");
+
+jedis.ftCreate("idx", IndexOptions.defaultOptions().setDefinition(def), schema);
+```
+
+**Incorrect:** Over-indexing or indexing unused fields.
+
+```
+# Bad: Indexing every field "just in case"
+FT.CREATE idx:products ON HASH PREFIX 1 product:
+    SCHEMA
+        name TEXT
+        description TEXT
+        category TEXT
+        subcategory TEXT
+        brand TEXT
+        sku TEXT
+        price NUMERIC
+        cost NUMERIC
+        margin NUMERIC
+        ...
+```
+
+**Java** (Jedis):
+```java
+// Bad: No prefix means all hashes get indexed
+IndexDefinition def = new IndexDefinition(IndexDefinition.Type.HASH);
+// This will index every hash in the database!
+```
+
+**Tips:**
+- Start with the minimum required fields
+- Add fields as query patterns emerge
+- Use `FT.INFO` to monitor index size
+- Always specify a prefix to avoid indexing unrelated keys
+
+Reference: [Redis Search Indexing](https://redis.io/docs/latest/develop/interact/search-and-query/indexing/)
+