feat: sistem de linkuri publice pentru proprietăți

Expune fluxul de rezervare anonimă printr-un link public partajabil
(/book/<slug>), cu calendar public, cod QR și proprietate demo publică.

Backend:
- slug + list_on_landing pe Property; utilitar slugify (diacritice RO,
  cuvinte rezervate, ban all-digit) + migrare idempotentă raw-DDL rulată
  din entrypoint; SQLite WAL + busy_timeout
- GET /public/properties/{slug_or_id}(+/spaces): rezolvare slug/ID, 404 uniform
- GET /public/spaces/{id}/busy: doar {start_time,end_time} (fără PII),
  pending+approved, tz-aware/interval>60z → 422, orfan/privat → 404
- availability: scrub user_name/title (fix scurgere PII)
- POST /public/bookings: overlap pending+approved, cap 5/email/spațiu/zi,
  rate-limit per-IP, suprimare notificări+email pe demo, email confirmare guest
- PATCH slug (409 duplicat / 422 format / 403 non-manager); guest_email EmailStr
- email guest la aprobare/respingere cu cod #RB-<id>
- teste noi: test_public.py + test_migrate_slug.py (33 teste)

Frontend:
- rută /book/:slug; PublicBooking rescris cu calendar grid manual
  (PublicCalendar + GuestBookingForm), 30min, 08-20, mobil day-view, RO
- card „Link public" în PropertyDetail: copy, edit slug, QR pe URL-ul cu ID
- secțiune proprietăți publice + CTA pe Landing; buton copy în Properties

Gate aprobat (U1-U3, G1 grid manual, G2 list_on_landing); G3-G5 în TODOS.md.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/Properties.vue

@@ -55,6 +55,16 @@
         <div class="property-footer">
           <span class="space-count">{{ prop.space_count || 0 }} spaces</span>
           <div class="property-actions" @click.stop>
+            <button
+              class="btn-icon"
+              :class="{ 'btn-icon-success': copiedId === prop.id }"
+              :disabled="!canCopyLink(prop)"
+              :title="canCopyLink(prop) ? (copiedId === prop.id ? 'Copiat ✓' : 'Copiază link') : 'Proprietatea trebuie să fie publică pentru un link public'"
+              @click="copyLink(prop)"
+            >
+              <Check v-if="copiedId === prop.id" :size="15" />
+              <Link2 v-else :size="15" />
+            </button>
             <button
               class="btn-icon"
               :title="prop.is_active ? 'Deactivate' : 'Activate'"
@@ -136,7 +146,7 @@ import { useRouter } from 'vue-router'
 import { propertiesApi, handleApiError } from '@/services/api'
 import { useAuthStore } from '@/stores/auth'
 import Breadcrumb from '@/components/Breadcrumb.vue'
-import { Landmark, Plus, PowerOff, Trash2 } from 'lucide-vue-next'
+import { Landmark, Plus, PowerOff, Trash2, Link2, Check } from 'lucide-vue-next'
 import type { Property } from '@/types'
 
 const router = useRouter()
@@ -260,6 +270,37 @@ const goToProperty = (id: number) => {
   router.push(`/properties/${id}`)
 }
 
+const copiedId = ref<number | null>(null)
+
+const canCopyLink = (prop: Property) => {
+  return !!prop.is_public && !!prop.slug
+}
+
+const copyLink = async (prop: Property) => {
+  if (!canCopyLink(prop)) return
+  const url = `${window.location.origin}/book/${prop.slug}`
+  try {
+    if (navigator.clipboard && window.isSecureContext) {
+      await navigator.clipboard.writeText(url)
+    } else {
+      const textarea = document.createElement('textarea')
+      textarea.value = url
+      textarea.style.position = 'fixed'
+      textarea.style.opacity = '0'
+      document.body.appendChild(textarea)
+      textarea.select()
+      document.execCommand('copy')
+      document.body.removeChild(textarea)
+    }
+    copiedId.value = prop.id
+    setTimeout(() => {
+      if (copiedId.value === prop.id) copiedId.value = null
+    }, 2000)
+  } catch (err) {
+    error.value = handleApiError(err)
+  }
+}
+
 onMounted(() => {
   loadProperties()
 })
@@ -491,6 +532,24 @@ onMounted(() => {
   background: color-mix(in srgb, var(--color-danger) 8%, transparent);
 }
 
+.btn-icon-success {
+  border-color: var(--color-success);
+  color: var(--color-success);
+  background: color-mix(in srgb, var(--color-success) 8%, transparent);
+}
+
+.btn-icon:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+  pointer-events: auto;
+}
+
+.btn-icon:disabled:hover {
+  border-color: var(--color-border);
+  color: var(--color-text-secondary);
+  background: var(--color-surface);
+}
+
 /* Modal */
 .modal {
   position: fixed;