feat: backdated reported date for old active tickets

Wahab can now enter historical tickets that keep their true reported date:

- Add nullable tickets.reported_at (DateTime) via alembic d5e0f2a1c3b4;
  backfill existing rows from created_at so nothing shows empty.
- TicketCreate.reported_at (optional) is persisted by create_ticket and
  defaults to now when omitted, so existing create behavior is unchanged.
- New-issue form gains a 'Reported Date' date picker (defaults to today,
  past dates allowed, future blocked) and sends reported_at in the payload.
- List and detail pages show 'Reported' next to 'Created' (date-only,
  labeled) so backdated tickets are obvious; SLA deadline is unchanged and
  still runs from creation time so backfilling never instantly breaches.
- Tests: backdated create persists + is exposed on list/detail; omitted
  reported_at defaults to now; SLA window unchanged; full datetime round trip.

app/templates/tickets/new.html

@@ -154,6 +154,15 @@
                 </div>
             </div>
 
+            <!-- Reported date (backdating support) -->
+            <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
+                <div>
+                    <label class="block text-sm font-medium text-gray-700 mb-1">Reported Date</label>
+                    <input type="date" x-model="form.reported_date" :max="todayStr" class="w-full px-4 py-2.5 rounded-lg border border-gray-300 focus:ring-2 focus:ring-denya-500 focus:border-transparent outline-none">
+                    <p class="mt-1 text-xs text-gray-400">Defaults to today. Use a past date when entering an old/backlogged issue — it stays active in the normal workflow.</p>
+                </div>
+            </div>
+
             <!-- Photo Upload -->
             <div>
                 <label class="block text-sm font-medium text-gray-700 mb-1">Photos (Before)</label>
@@ -205,8 +214,10 @@
                 priority: '',
                 description: '',
                 reporter: '',
-                reported_via: ''
+                reported_via: '',
+                reported_date: ''
             },
+            todayStr: '',
             priorityAuto: false,
             categories: [],
             subCategories: [],
@@ -223,6 +234,14 @@
             async init() {
                 await this.loadCategories();
                 await this.loadUnits();
+                // Default reported date to today (local), allow backdating via the date picker
+                this.todayStr = this.localDateStr(new Date());
+                if (!this.form.reported_date) this.form.reported_date = this.todayStr;
+            },
+
+            localDateStr(d) {
+                const offset = d.getTimezoneOffset();
+                return new Date(d.getTime() - offset * 60000).toISOString().slice(0, 10);
             },
 
             // ── Report mode ──────────────────────────────────────────
@@ -384,6 +403,7 @@
                         unit_id: this.form.unit.id,
                         customer_name: this.form.customer_name || null,
                         phone: this.form.phone || null,
+                        reported_at: this.form.reported_date || null,
                     };
 
                     const ticket = await app().apiPost('/api/tickets', payload);