refactor: Refactor json loading mechanism & more

- Move json loading into separate crate `common`
- Add new http route for handling SRTools API
- Listen to `freesr-data.json` file change, and sync with client immediately
- Move json loading into `PlayerSession`, instead of load it everytime
- Implement global buff for Castorice
- Implement `GetBigDataAllRecommendCsReq`

sdkserver/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2024"
 anyhow.workspace = true
 env_logger.workspace = true
 
+tower-http = { workspace = true, features = ["cors"]}
 axum.workspace = true
 axum-server.workspace = true
 
@@ -28,3 +29,4 @@ ansi_term.workspace = true
 prost.workspace = true
 rbase64.workspace = true
 proto.workspace = true
+common.workspace = true