feat: Phase 2 — Mission rotation management + multi-file upload

- Backend: add terrain field to Arma3MissionManager.list_missions()
- Backend: add missions field to ServerConfig Pydantic model
- Backend: add GET /missions/rotation and PUT /missions/rotation endpoints
- Frontend: Mission type gains terrain field; new MissionRotationEntry type
- Frontend: useServerMissionRotation and useUpdateMissionRotation hooks
- Frontend: useUploadMission updated to accept File[] with sequential upload
- Frontend: MissionList redesigned with Available Missions + Mission Rotation sections
- Frontend: per-file upload progress tracking, terrain badges, difficulty select
- Tests: 5 new tests; fixed existing useUploadMission test for File[] API; 141 pass

backend/adapters/arma3/config_generator.py

@@ -57,6 +57,7 @@ class ServerConfig(BaseModel):
     headless_clients: list[str] = Field(default_factory=list)
     local_clients: list[str] = Field(default_factory=list)
     admin_uids: list[str] = Field(default_factory=list)
+    missions: list[dict] = Field(default_factory=list)
 
 
 class BasicConfig(BaseModel):

backend/adapters/arma3/mission_manager.py

@@ -52,10 +52,12 @@ class Arma3MissionManager:
         try:
             for entry in missions_dir.iterdir():
                 if entry.is_file() and entry.suffix.lower() == _ALLOWED_EXTENSION:
+                    parsed = self.parse_mission_filename(entry.name)
                     missions.append({
                         "name": entry.stem,
                         "filename": entry.name,
                         "size_bytes": entry.stat().st_size,
+                        "terrain": parsed["terrain"],
                     })
         except OSError as exc:
             raise AdapterError(f"Cannot list missions: {exc}") from exc

backend/core/servers/missions_router.py

@@ -5,6 +5,7 @@ import logging
 from typing import Annotated
 
 from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, status
+from pydantic import BaseModel
 from sqlalchemy.engine import Connection
 
 from adapters.exceptions import AdapterError
@@ -20,6 +21,16 @@ router = APIRouter(prefix="/servers/{server_id}/missions", tags=["missions"])
 _MAX_UPLOAD_SIZE = 500 * 1024 * 1024  # 500 MB
 
 
+class MissionRotationEntry(BaseModel):
+    name: str
+    difficulty: str = ""
+
+
+class MissionRotationUpdate(BaseModel):
+    missions: list[MissionRotationEntry]
+    config_version: int
+
+
 def _ok(data):
     return {"success": True, "data": data, "error": None}
 
@@ -35,6 +46,35 @@ def _get_mission_manager(server_id: int, game_type: str):
     return adapter.get_mission_manager(server_id)
 
 
+@router.get("/rotation")
+def get_mission_rotation(
+    server_id: int,
+    db: Annotated[Connection, Depends(get_db)],
+    _user: Annotated[dict, Depends(get_current_user)],
+) -> dict:
+    """Get the current mission rotation from the server config."""
+    config = ServerService(db).get_config_section(server_id, "server")
+    missions = config.get("missions", [])
+    return _ok({"missions": missions})
+
+
+@router.put("/rotation")
+def update_mission_rotation(
+    server_id: int,
+    body: MissionRotationUpdate,
+    db: Annotated[Connection, Depends(get_db)],
+    _admin: Annotated[dict, Depends(require_admin)],
+) -> dict:
+    """Replace the mission rotation in the server config."""
+    updated = ServerService(db).update_config_section(
+        server_id=server_id,
+        section="server",
+        data={"missions": [e.model_dump() for e in body.missions]},
+        expected_version=body.config_version,
+    )
+    return _ok({"missions": updated.get("missions", [])})
+
+
 @router.get("")
 def list_missions(
     server_id: int,