feat(infrastructure): Add night-scheduler for automated Docker service shutdown

Implement dashboard-controlled night mode for automatic Docker service
management. Services are stopped at a configurable time (default 22:00)
and restarted in the morning (default 06:00).

Features:
- Python/FastAPI scheduler service (port 8096)
- Admin dashboard API routes at /api/admin/night-mode
- Toggle for enable/disable night mode
- Time picker for shutdown and startup times
- Manual start/stop buttons for immediate actions
- Excluded services (night-scheduler, nginx always run)

Files added:
- night-scheduler/scheduler.py - Main scheduler with REST API
- night-scheduler/Dockerfile - Container with Docker CLI
- night-scheduler/requirements.txt - FastAPI, Uvicorn, Pydantic
- night-scheduler/tests/test_scheduler.py - Unit tests
- admin-v2/app/api/admin/night-mode/* - API proxy routes
- .claude/rules/night-scheduler.md - Developer documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

admin-v2/app/api/admin/night-mode/execute/route.ts

@@ -0,0 +1,50 @@
+/**
+ * Night Mode Execute API Route
+ *
+ * POST - Sofortige Ausführung (start/stop)
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const NIGHT_SCHEDULER_URL = process.env.NIGHT_SCHEDULER_URL || 'http://night-scheduler:8096'
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+
+    if (!body.action || !['start', 'stop'].includes(body.action)) {
+      return NextResponse.json(
+        { error: 'Aktion muss "start" oder "stop" sein' },
+        { status: 400 }
+      )
+    }
+
+    const response = await fetch(`${NIGHT_SCHEDULER_URL}/api/night-mode/execute`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(body),
+    })
+
+    if (!response.ok) {
+      const error = await response.text()
+      return NextResponse.json(
+        { error: `Night-Scheduler Fehler: ${error}` },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Night-Mode Execute API Error:', error)
+    return NextResponse.json(
+      {
+        error: 'Night-Scheduler nicht erreichbar',
+        details: error instanceof Error ? error.message : 'Unbekannter Fehler',
+      },
+      { status: 503 }
+    )
+  }
+}

admin-v2/app/api/admin/night-mode/route.ts

@@ -0,0 +1,77 @@
+/**
+ * Night Mode API Route
+ *
+ * Proxy für den night-scheduler Service (Port 8096)
+ * GET  - Status abrufen
+ * POST - Konfiguration speichern
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const NIGHT_SCHEDULER_URL = process.env.NIGHT_SCHEDULER_URL || 'http://night-scheduler:8096'
+
+export async function GET() {
+  try {
+    const response = await fetch(`${NIGHT_SCHEDULER_URL}/api/night-mode`, {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      cache: 'no-store',
+    })
+
+    if (!response.ok) {
+      const error = await response.text()
+      return NextResponse.json(
+        { error: `Night-Scheduler Fehler: ${error}` },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Night-Mode API Error:', error)
+    return NextResponse.json(
+      {
+        error: 'Night-Scheduler nicht erreichbar',
+        details: error instanceof Error ? error.message : 'Unbekannter Fehler',
+      },
+      { status: 503 }
+    )
+  }
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+
+    const response = await fetch(`${NIGHT_SCHEDULER_URL}/api/night-mode`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(body),
+    })
+
+    if (!response.ok) {
+      const error = await response.text()
+      return NextResponse.json(
+        { error: `Night-Scheduler Fehler: ${error}` },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Night-Mode API Error:', error)
+    return NextResponse.json(
+      {
+        error: 'Night-Scheduler nicht erreichbar',
+        details: error instanceof Error ? error.message : 'Unbekannter Fehler',
+      },
+      { status: 503 }
+    )
+  }
+}

admin-v2/app/api/admin/night-mode/services/route.ts

@@ -0,0 +1,41 @@
+/**
+ * Night Mode Services API Route
+ *
+ * GET - Liste aller Services abrufen
+ */
+
+import { NextResponse } from 'next/server'
+
+const NIGHT_SCHEDULER_URL = process.env.NIGHT_SCHEDULER_URL || 'http://night-scheduler:8096'
+
+export async function GET() {
+  try {
+    const response = await fetch(`${NIGHT_SCHEDULER_URL}/api/night-mode/services`, {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      cache: 'no-store',
+    })
+
+    if (!response.ok) {
+      const error = await response.text()
+      return NextResponse.json(
+        { error: `Night-Scheduler Fehler: ${error}` },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Night-Mode Services API Error:', error)
+    return NextResponse.json(
+      {
+        error: 'Night-Scheduler nicht erreichbar',
+        details: error instanceof Error ? error.message : 'Unbekannter Fehler',
+      },
+      { status: 503 }
+    )
+  }
+}