feat: Mini-Cloud Plattform - komplette Implementierung Phase 0-8

Selbstgehostete Web-Cloud mit Dateiverwaltung, Kalender, Kontakte,
Email-Webclient, Office-Viewer und Passwort-Manager.

Backend (Flask/Python):
- JWT-Auth mit Access/Refresh Tokens, Benutzerverwaltung
- Dateien: Upload/Download, Ordner, Berechtigungen, Share-Links
- Kalender: CRUD, Teilen, iCal-Export, CalDAV well-known URLs
- Kontakte: Adressbuecher, vCard-Export, Teilen
- Email: IMAP/SMTP-Proxy, Multi-Account
- Office-Viewer: DOCX/XLSX/PPTX/PDF Vorschau
- Passwort-Manager: AES-256-GCM clientseitig, KeePass-Import
- Sync-API fuer Desktop/Mobile-Clients
- SQLite mit WAL-Modus

Frontend (Vue 3 + PrimeVue):
- Datei-Explorer mit Breadcrumbs und Share-Dialogen
- Monatskalender mit Event-Verwaltung
- Kontaktliste mit Adressbuch-Sidebar
- Email-Client mit 3-Spalten-Layout
- Passwort-Manager mit TOTP und Passwort-Generator
- Admin-Panel, Settings, oeffentliche Share-Seite

Docker: Multi-Stage Build, Bind Mounts (keine Volumes)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/LoginView.vue

@@ -0,0 +1,146 @@
+<template>
+  <div class="auth-container">
+    <div class="auth-card">
+      <div class="auth-header">
+        <i class="pi pi-cloud" style="font-size: 2.5rem; color: var(--p-primary-color)"></i>
+        <h1>Mini-Cloud</h1>
+        <p>Anmelden</p>
+      </div>
+
+      <form @submit.prevent="handleLogin" class="auth-form">
+        <div class="field">
+          <label for="username">Benutzername</label>
+          <InputText
+            id="username"
+            v-model="username"
+            placeholder="Benutzername"
+            :invalid="!!error"
+            autofocus
+            fluid
+          />
+        </div>
+
+        <div class="field">
+          <label for="password">Passwort</label>
+          <Password
+            id="password"
+            v-model="password"
+            placeholder="Passwort"
+            :feedback="false"
+            :invalid="!!error"
+            toggle-mask
+            fluid
+          />
+        </div>
+
+        <Message v-if="error" severity="error" :closable="false">{{ error }}</Message>
+
+        <Button
+          type="submit"
+          label="Anmelden"
+          :loading="loading"
+          fluid
+        />
+      </form>
+
+      <div class="auth-footer">
+        <router-link to="/register">Noch kein Konto? Registrieren</router-link>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAuthStore } from '../stores/auth'
+import InputText from 'primevue/inputtext'
+import Password from 'primevue/password'
+import Button from 'primevue/button'
+import Message from 'primevue/message'
+
+const router = useRouter()
+const auth = useAuthStore()
+
+const username = ref('')
+const password = ref('')
+const error = ref('')
+const loading = ref(false)
+
+async function handleLogin() {
+  error.value = ''
+  loading.value = true
+  try {
+    await auth.login(username.value, password.value)
+    router.push('/')
+  } catch (err) {
+    error.value = err.response?.data?.error || 'Anmeldung fehlgeschlagen'
+  } finally {
+    loading.value = false
+  }
+}
+</script>
+
+<style scoped>
+.auth-container {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--p-surface-50);
+}
+
+.auth-card {
+  background: var(--p-surface-0);
+  border-radius: 12px;
+  padding: 2.5rem;
+  width: 100%;
+  max-width: 400px;
+  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
+}
+
+.auth-header {
+  text-align: center;
+  margin-bottom: 2rem;
+}
+
+.auth-header h1 {
+  margin: 0.5rem 0 0.25rem;
+  font-size: 1.5rem;
+}
+
+.auth-header p {
+  color: var(--p-text-muted-color);
+  margin: 0;
+}
+
+.auth-form .field {
+  margin-bottom: 1rem;
+}
+
+.auth-form .field label {
+  display: block;
+  margin-bottom: 0.5rem;
+  font-weight: 500;
+  font-size: 0.875rem;
+}
+
+.auth-form button {
+  margin-top: 0.5rem;
+}
+
+.auth-footer {
+  text-align: center;
+  margin-top: 1.5rem;
+  font-size: 0.875rem;
+}
+
+.auth-footer a {
+  color: var(--p-primary-color);
+  text-decoration: none;
+}
+
+.auth-footer a:hover {
+  text-decoration: underline;
+}
+</style>