feat: in-app support form with email + Gitea issue integration (v0.49.0)

Users can now report bugs, suggestions, or questions from a new /support
page. Each submission sends a confirmation email and, when GITEA_URL/
GITEA_TOKEN/GITEA_REPO are configured in admin Settings, opens a labeled
issue on that repo automatically (best-effort — failure doesn't block the
ticket). Admins get a Support section to triage status and retry failed
Gitea issue creation.

New support_tickets table, gitea.ts client, site-settings entries for the
three new secrets, and OpenAPI docs for the two user-facing endpoints.

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

apps/web/messages/en.json

@@ -84,6 +84,7 @@
     "language": "Language",
     "notifications": "Notifications",
     "viewProfile": "View profile",
+    "support": "Support",
     "lightMode": "Light mode",
     "darkMode": "Dark mode",
     "systemMode": "System"
@@ -450,6 +451,35 @@
       "description": "Receive HTTP callbacks when events happen in your Epicure account."
     }
   },
+  "support": {
+    "title": "Support",
+    "subtitle": "Report a bug, share a suggestion, or ask a question — we read every message.",
+    "typeLabel": "Type",
+    "typeBug": "Bug report",
+    "typeSuggestion": "Suggestion",
+    "typeQuestion": "Question",
+    "titleLabel": "Title",
+    "titlePlaceholder": "Short summary of the issue or idea",
+    "descriptionLabel": "Description",
+    "descriptionPlaceholder": "What happened, what you expected, and steps to reproduce (if a bug) — or details on your suggestion/question.",
+    "submitButton": "Submit",
+    "submitting": "Submitting…",
+    "submitSuccess": "Thanks! We received your message.",
+    "submitFailed": "Failed to submit — try again.",
+    "historyTitle": "Your tickets",
+    "noTickets": "You haven't submitted anything yet.",
+    "viewIssue": "View issue",
+    "status": {
+      "open": "Open",
+      "triaged": "Triaged",
+      "closed": "Closed"
+    },
+    "type": {
+      "bug": "Bug",
+      "suggestion": "Suggestion",
+      "question": "Question"
+    }
+  },
   "print": {
     "footer": "Printed from Epicure",
     "day": "Day",