Use one name for each thing the UI shows (closes #399)

The UI gave one thing several names. The `database` type is now Archive in the type list, on its badge and on the edit page, and its settings read "Archive expiry" and "Archive rotation" everywhere. The retry field is "Delivery attempts", with help text, errors and the target list saying it counts every attempt; a stored 0 shows as one attempt. The target list uses one capitalisation. The navbar says "Sign out", the sign-in page "Sign in", and the resubmit notice "webhook" instead of "source". The README follows. Stored values, their meaning, routes and form field names are unchanged.

Model: opus-5-5

internal/handlers/target_paused_test.go

@@ -81,10 +81,10 @@ func TestPausedTarget_ShownUntilBreakerCloses(t *testing.T) {
 
 	list := targetList(t, renderSourceDetailPage(t, h, sess, wh.ID))
 	assert.Regexp(t, "t-http http Active Edit Deactivate Delete "+
-		"Deliveries Paused: after repeated failures, until "+cooldownEnds+
+		"Deliveries paused: after repeated failures, until "+cooldownEnds+
 		", then one waiting delivery is sent to test the target while "+
 		"the others wait at least one more cooldown", list)
-	assert.Equal(t, 1, strings.Count(list, "Paused"))
+	assert.Equal(t, 1, strings.Count(list, "Deliveries paused"))
 
 	log := renderSourceLogsPage(t, h, sess, wh.ID)
 	assert.Equal(t, 2, strings.Count(log, "t-http: waiting"))
@@ -105,7 +105,7 @@ func TestPausedTarget_ShownUntilBreakerCloses(t *testing.T) {
 
 	list = targetList(t, renderSourceDetailPage(t, h, sess, wh.ID))
 	assert.Contains(t, list, "t-http http Active Edit Deactivate Delete "+
-		"Deliveries Paused: held while one delivery tests whether the "+
+		"Deliveries paused: held while one delivery tests whether the "+
 		"target has recovered")
 	// Not the whole list: the add target form above the rows says UTC.
 	assert.NotContains(t, targetRow(list, "t-http", "t-log"), "UTC")
@@ -115,7 +115,7 @@ func TestPausedTarget_ShownUntilBreakerCloses(t *testing.T) {
 	breakers.Set(target.ID, delivery.CircuitClosed, 0)
 
 	list = targetList(t, renderSourceDetailPage(t, h, sess, wh.ID))
-	assert.NotContains(t, list, "Paused")
+	assert.NotContains(t, list, "Deliveries paused")
 
 	assertRetryingNotWaiting(t, h, sess, wh.ID, retrying, backedOff)
 }