Feature: HTMX + Jinja2 Frontend ersetzt Next.js komplett

- Kein Node.js, kein npm, kein Build-Schritt mehr
- HTMX 2.0.4 + PicoCSS 2 vendored in backend/static/
- Jinja2 Templates für alle 9 Seiten (Dashboard, ZFS, Snapshots,
  Shares, Identities, Logs, Services, Navigator, Login)
- HTMX Fragments für Live-Updates (30s Polling Dashboard)
- JWT als httpOnly Cookie statt localStorage
- Disk Usage zeigt TB/PB korrekt (Jinja2 serverseitig formatiert)
- Update-safe: nur Python-Deps, keine npm-Abhängigkeiten

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/main.py

@@ -15,11 +15,12 @@ from fastapi import FastAPI, Request, WebSocket, WebSocketDisconnect, status
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse, FileResponse
 from fastapi.staticfiles import StaticFiles
+from fastapi.templating import Jinja2Templates
 
 # Add backend to path for imports
 sys.path.insert(0, str(Path(__file__).parent))
 
-from routers import auth, pools, datasets, snapshots, navigator, identities, shares, system
+from routers import auth, pools, datasets, snapshots, navigator, identities, shares, system, pages
 from services.zfs_runner import zfs_runner
 
 # Configure logging
@@ -114,7 +115,11 @@ async def websocket_endpoint(websocket: WebSocket):
         ws_clients.discard(websocket)
 
 
-# Include routers (must be before static files mounting)
+# Static assets (HTMX, PicoCSS — vendored)
+_static_dir = os.path.join(os.path.dirname(__file__), "static")
+app.mount("/static", StaticFiles(directory=_static_dir), name="static")
+
+# Include API routers first
 app.include_router(auth.router)
 app.include_router(pools.router)
 app.include_router(datasets.router)
@@ -124,6 +129,9 @@ app.include_router(identities.router)
 app.include_router(shares.router)
 app.include_router(system.router)
 
+# HTML pages router last (catches /, /login, /zfs, /fragments/*)
+app.include_router(pages.router)
+
 
 
 # Health check endpoint (no auth required)
@@ -156,18 +164,6 @@ async def status_check():
     }
 
 
-# Root endpoint - API info only
-@app.get("/")
-async def root(request: Request):
-    """API info"""
-    return {
-        "name": "ZMB Webui API",
-        "version": "1.0.0",
-        "docs": "/docs",
-        "frontend": str(request.base_url)
-    }
-
-
 # Error handler
 @app.exception_handler(Exception)
 async def general_exception_handler(request: Request, exc: Exception):