ZMB Webui: Complete Project – Rebrand & Initial Clean Commit

ARCHITECTURE
============
Backend: FastAPI + uvicorn (port 8000)
  - JWT authentication with PAM system users
  - ZFS CLI wrapper with caching (30-60s TTL)
  - WebSocket pool status broadcaster (30s interval)
  - Services: auth, zfs_runner, file_manager, shares, identities, system_info
  - Routers: pools, datasets, snapshots, shares, identities, navigator, system

Frontend: Next.js 15 + TypeScript (static export)
  - Incremental Static Regeneration (ISR) for weak hardware
  - Type-safe API client (lib/api.ts)
  - Dark mode + custom Tailwind theme
  - Pages: Dashboard, Login, Snapshots, Datasets, Shares, etc.

DEPLOYMENT
==========
Test Target: 192.168.1.179:8090 (Debian LXC)
Production: 10.66.120.3:9090 (Raspberry Pi 4GB ARM64)
Updater: Automated Gitea-based deployment (update-test.sh, update-pi.sh)

FEATURES COMPLETED
==================
Phase 3a: Dashboard Quick Stats (System, CPU, Memory, Storage)
  - Real-time stats with color-coded progress bars
  - Responsive grid layout (mobile: 1, tablet: 2, desktop: 4 columns)
  - ISR-optimized for fast loads on weak hardware

REBRANDING
==========
Renamed throughout:
  - Project: 'ZFS Manager' → 'ZMB Webui'
  - Services: 'zfs-manager' → 'zmb-webui'
  - Systemd units: zfs-manager-backend → zmb-webui-backend
  - Configuration files and documentation

Co-Authored-By: Patrick <patrick@perlbach24.de>

backend/routers/snapshots.py

@@ -0,0 +1,113 @@
+"""
+Snapshot management endpoints
+"""
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+from services.zfs_runner import zfs_runner
+from services.auth import auth_service
+from models import Snapshot
+
+router = APIRouter(prefix="/api/snapshots", tags=["snapshots"])
+security = HTTPBearer()
+
+
+def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security)):
+    """Verify JWT token and return username"""
+    username = auth_service.verify_token(credentials.credentials)
+    if not username:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid token"
+        )
+    return username
+
+
+class CreateSnapshotRequest(BaseModel):
+    dataset: str
+    name: Optional[str] = None  # Auto-generate if not provided
+
+
+class RollbackSnapshotRequest(BaseModel):
+    snapshot: str
+
+
+@router.get("/", response_model=List[Snapshot])
+async def list_snapshots(
+    dataset: Optional[str] = None,
+    limit: int = 50,
+    current_user: str = Depends(get_current_user)
+):
+    """
+    List snapshots (optionally filtered by dataset)
+    """
+    try:
+        snapshots = zfs_runner.list_snapshots(dataset, limit=limit)
+        return [
+            Snapshot(
+                name=s["name"],
+                dataset=s["name"].split("@")[0],  # Extract dataset part
+                created=s["creation"],
+                used=s["used"],
+                referenced=s["referenced"],
+                creation_datetime=datetime.fromtimestamp(s["creation"]).isoformat() + "Z"
+            )
+            for s in snapshots
+        ]
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.post("/", response_model=dict)
+async def create_snapshot(
+    request: CreateSnapshotRequest,
+    current_user: str = Depends(get_current_user)
+):
+    """
+    Create new snapshot
+    """
+    try:
+        result = zfs_runner.create_snapshot(request.dataset, request.name)
+        if result.get("status") == "error":
+            raise HTTPException(status_code=400, detail=result.get("message"))
+        return result
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.delete("/{snapshot_name:path}")
+async def delete_snapshot(
+    snapshot_name: str,
+    current_user: str = Depends(get_current_user)
+):
+    """
+    Delete snapshot
+    """
+    try:
+        result = zfs_runner.destroy_snapshot(snapshot_name)
+        if result.get("status") == "error":
+            raise HTTPException(status_code=400, detail=result.get("message"))
+        return result
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.post("/rollback")
+async def rollback_snapshot(
+    request: RollbackSnapshotRequest,
+    current_user: str = Depends(get_current_user)
+):
+    """
+    Rollback dataset to snapshot (WARNING: Destroys data after snapshot!)
+    """
+    try:
+        result = zfs_runner.rollback_snapshot(request.snapshot)
+        if result.get("status") == "error":
+            raise HTTPException(status_code=400, detail=result.get("message"))
+        return result
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))