Take hono to 4.13.7 and let Dependabot open the next one

Three medium advisories land on hono before 4.13.5: a toSSG() path
escape, a query parser that reads parameters past the URL fragment, and
unbounded dot-notation nesting in parseBody(). Only the second one
touches this server -- c.req.query() is read in imageproxy, icsproxy and
app -- and even there safeFetch validates the value it actually fetches
rather than a separate pre-check, so there was nothing to desync. toSSG
and parseBody are never called. The bump is still worth taking on its
own: it is a patch release with no API change.

The declared range moves with it, from ^4.7.4 to ^4.13.7, so the
security floor is recorded in server/package.json and not only in the
lockfile.

The dependabot.yml is the actual fix for how these were found. There was
no config, so nothing opened a PR and the alerts sat on a dashboard
until someone thought to look. Routine updates now group into one PR a
week; majors stay separate, because they are migrations.

.github/dependabot.yml

@@ -0,0 +1,44 @@
+version: 2
+updates:
+  # The npm entry sits at the root because that is where the single lockfile
+  # is: root, server and web are one npm workspace, so one entry covers all
+  # three. Pointing entries at server/ or web/ would find package.json files
+  # with no lockfile beside them and update nothing.
+  - package-ecosystem: npm
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: tuesday
+      time: "09:00"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 5
+    groups:
+      # Everything routine arrives as one PR a week, so the dashboard is not
+      # the only place these get noticed. Majors are deliberately left out of
+      # the group: they are migrations, not bumps -- vitest 3 to 4 is one --
+      # and each deserves its own PR and its own CI run.
+      minor-and-patch:
+        update-types:
+          - minor
+          - patch
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: tuesday
+      time: "09:00"
+      timezone: Etc/UTC
+    groups:
+      actions:
+        patterns:
+          - "*"
+  # The runtime and build stages both pin node:22-alpine, so this is what
+  # keeps the published container images off a stale base between the weekly
+  # releases.
+  - package-ecosystem: docker
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: tuesday
+      time: "09:00"
+      timezone: Etc/UTC