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/src/services/sr_tools.rs

@@ -0,0 +1,50 @@
+use axum::Json;
+use common::sr_tools::FreesrData;
+use serde::{Deserialize, Serialize};
+use tokio::fs;
+
+pub const SRTOOLS_UPLOAD_ENDPOINT: &str = "/srtools";
+
+#[derive(Debug, Deserialize)]
+pub struct SrToolDataReq {
+    #[allow(dead_code)]
+    pub data: Option<FreesrData>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct SrToolDataRsp {
+    pub message: String,
+    pub status: u32,
+}
+
+#[tracing::instrument]
+pub async fn sr_tool_save(Json(json): Json<SrToolDataReq>) -> Json<SrToolDataRsp> {
+    let Some(json) = json.data else {
+        return Json(SrToolDataRsp {
+            message: String::from("OK"),
+            status: 200,
+        });
+    };
+
+    let json = match serde_json::to_string_pretty(&json) {
+        Ok(json) => json,
+        Err(err) => {
+            return Json(SrToolDataRsp {
+                message: format!("malformed json: {}", err),
+                status: 200,
+            });
+        }
+    };
+
+    if let Err(err) = fs::write("freesr-data.json", json).await {
+        return Json(SrToolDataRsp {
+            message: format!("failed to write freesr-data.json: {}", err),
+            status: 200,
+        });
+    };
+
+    Json(SrToolDataRsp {
+        message: String::from("OK"),
+        status: 200,
+    })
+}