Add v1 shortener: Bearer API, public 302, landing, and CI.

Standalone Django service so callers can mint links and phones get a 302.
Closes #1.

site/links/debug_views.py

@@ -0,0 +1,41 @@
+"""DEBUG-only form to mint a short link without curling the API."""
+
+from django.conf import settings
+from django.contrib import messages
+from django.http import Http404
+from django.shortcuts import render
+from django.views.decorators.http import require_http_methods
+
+from links.forms import DebugCreateForm
+from links.services import CodeCollisionError, create_link
+
+
+@require_http_methods(["GET", "POST"])
+def debug_create(request):
+    if not settings.DEBUG:
+        raise Http404()
+
+    form = DebugCreateForm(request.POST or None)
+    created_link = None
+    if request.method == "POST" and form.is_valid():
+        try:
+            created_link, minted = create_link(
+                target_url=form.cleaned_data["target_url"],
+                title=form.cleaned_data.get("title") or "",
+                external_ref=form.cleaned_data.get("external_ref") or "",
+                expires_at=None,
+                token_name="debug",
+            )
+        except CodeCollisionError:
+            form.add_error(None, "Could not allocate a unique code.")
+        else:
+            if minted:
+                messages.success(request, "Short link created.")
+            else:
+                messages.info(request, "Existing active link returned (same URL + ref).")
+
+    return render(
+        request,
+        "links/debug_create.html",
+        {"form": form, "created_link": created_link},
+    )