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/delivery/target_config_view.go

@@ -177,16 +177,17 @@ func httpConfigFields(t *database.Target) []ConfigField {
 }
 
 // maxRetriesField describes a target's retry count, which lives
-// on the target row rather than in its configuration blob.
+// on the target row rather than in its configuration blob. A
+// stored 0 makes a single attempt, so it is shown as 1.
 func maxRetriesField(t *database.Target) ConfigField {
-	retries := strconv.Itoa(t.MaxRetries)
+	attempts := strconv.Itoa(t.MaxRetries)
 	if t.MaxRetries == 0 {
-		retries += " (fire-and-forget)"
+		attempts = "1 (fire-and-forget: no retries, no circuit breaker)"
 	}
 
 	return ConfigField{
-		Label: "Max Retries",
-		Value: retries,
+		Label: "Delivery attempts",
+		Value: attempts,
 	}
 }
 
@@ -213,10 +214,10 @@ func databaseConfigFields(configJSON string) []ConfigField {
 	}
 
 	return []ConfigField{{
-		Label: "Archive Expiry",
+		Label: "Archive expiry",
 		Value: value,
 	}, {
-		Label: "Archive Rotation",
+		Label: "Archive rotation",
 		Value: rotation,
 	}}
 }