feat(ids): 实现基于Snowflake的分布式ID生成功能

新增rs-snowflake依赖并实现分布式ID生成工具
在utils模块中添加ids子模块，提供业务ID生成与解析功能
替换原有UUID生成方式为分布式ID生成器

backend/Cargo.lock

@@ -2552,6 +2552,12 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "rs-snowflake"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e60ef3b82994702bbe4e134d98aadca4b49ed04440148985678d415c68127666"
+
 [[package]]
 name = "rsa"
 version = "0.9.8"
@@ -3911,6 +3917,7 @@ dependencies = [
  "reqwest",
  "rhai",
  "rquickjs",
+ "rs-snowflake",
  "sea-orm",
  "serde",
  "serde_json",