refactor, add modularity

app/entities/statuses.py

@@ -0,0 +1,13 @@
+import json
+from ..mcp import mcp
+from ..client import _get
+
+
+@mcp.tool()
+def get_issue_statuses() -> str:
+    """
+    Get all available issue statuses in Redmine.
+    Use this to find the correct status_id before calling update_issue_status.
+    """
+    data = _get("/issue_statuses.json")
+    return json.dumps(data["issue_statuses"], ensure_ascii=False, indent=2)