Add a Download button that exports a database target's archive as gzipped JSON (closes #374)

Each database target on the webhook page links to
/hook/ID/targets/TARGETID/download, which streams the target's archive
as archive-WEBHOOK-TARGET-YYYYMMDDTHHMMSSZ.json.gz: the webhook, the
target, exported_at, and archived_events, one object per row keyed by
column, a body that is not valid UTF-8 in base64 with body_encoding.
The export reads the rows through one cursor on its own connection
inside a read-only transaction: one snapshot, and no write lock. A
download runs for as long as the client keeps reading, and one that
fails after it has started aborts the connection. The handler holds the
rename lock only while it reads the names and opens the file. A missing
archive exports empty and is not created.

Model: opus-5-5

templates/source_detail.html

@@ -157,6 +157,9 @@
                             {{else}}
                             <span class="badge-error">Inactive</span>
                             {{end}}
+                            {{if eq .Type "database"}}
+                            <a href="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/download" class="text-xs text-gray-500 hover:text-primary-600" title="Download the archive as gzipped JSON">Download</a>
+                            {{end}}
                             <a href="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/edit" class="text-xs text-gray-500 hover:text-primary-600" title="Edit">Edit</a>
                             <form method="POST" action="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/toggle" class="inline">
                                 <input type="hidden" name="csrf_token" value="{{$.CSRFToken}}">