feat: split scan config and app settings into separate endpoints

- New GET/POST /api/v1/settings for status check interval
- Scan /api/v1/scan/config now handles ranges only
- Frontend: settingsApi client, SettingsPanel uses settingsApi
- ScanConfigModal no longer reads/writes interval
- 4 new backend tests for settings endpoint

backend/app/api/routes/scan.py

@@ -17,7 +17,6 @@ from app.services.scanner import run_scan
 
 class ScanConfig(BaseModel):
     ranges: list[str]
-    interval_seconds: int
 
 
 logger = logging.getLogger(__name__)
@@ -103,17 +102,13 @@ async def list_runs(db: AsyncSession = Depends(get_db), _: str = Depends(get_cur
 
 @router.get("/config", response_model=ScanConfig)
 async def get_scan_config(_: str = Depends(get_current_user)) -> ScanConfig:
-    return ScanConfig(
-        ranges=settings.scanner_ranges,
-        interval_seconds=settings.status_checker_interval,
-    )
+    return ScanConfig(ranges=settings.scanner_ranges)
 
 
 @router.post("/config", response_model=ScanConfig)
 async def update_scan_config(payload: ScanConfig, _: str = Depends(get_current_user)) -> ScanConfig:
     try:
         settings.scanner_ranges = payload.ranges
-        settings.status_checker_interval = payload.interval_seconds
         settings.save_overrides()
         return payload
     except Exception as exc:

backend/app/api/routes/settings.py

@@ -0,0 +1,29 @@
+"""App-level settings (status checker interval, etc.)."""
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+
+from app.api.deps import get_current_user
+from app.core.config import settings
+
+router = APIRouter()
+
+
+class AppSettings(BaseModel):
+    interval_seconds: int
+
+
+@router.get("", response_model=AppSettings)
+async def get_settings(_: str = Depends(get_current_user)) -> AppSettings:
+    return AppSettings(interval_seconds=settings.status_checker_interval)
+
+
+@router.post("", response_model=AppSettings)
+async def update_settings(
+    payload: AppSettings, _: str = Depends(get_current_user)
+) -> AppSettings:
+    try:
+        settings.status_checker_interval = payload.interval_seconds
+        settings.save_overrides()
+        return payload
+    except Exception as exc:
+        raise HTTPException(status_code=500, detail=str(exc)) from exc

backend/app/main.py

@@ -6,6 +6,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.api.routes import auth, canvas, edges, liveview, nodes, scan, status
+from app.api.routes import settings as settings_routes
 from app.core.config import settings
 from app.core.scheduler import start_scheduler, stop_scheduler
 from app.db.database import init_db
@@ -40,6 +41,7 @@ app.include_router(edges.router, prefix="/api/v1/edges", tags=["edges"])
 app.include_router(canvas.router, prefix="/api/v1/canvas", tags=["canvas"])
 app.include_router(scan.router, prefix="/api/v1/scan", tags=["scan"])
 app.include_router(status.router, prefix="/api/v1/status", tags=["status"])
+app.include_router(settings_routes.router, prefix="/api/v1/settings", tags=["settings"])
 app.include_router(liveview.router, prefix="/api/v1/liveview", tags=["liveview"])