feat(swagger): add Chinese summaries and descriptions for routes

Replace generic "METHOD path" summaries with curated Chinese summaries
and longer descriptions, surfaced in Swagger UI. Adds a parity test that
fails when a new tenant-api route is wired up without a docs entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/shared/swagger/swagger.go

@@ -72,12 +72,16 @@ func BuildOpenAPI(routes gin.RoutesInfo, cfg Config) map[string]any {
 		tagSet[tag] = struct{}{}
 
 		operationID := uniqueOperationID(method+"_"+sanitizeIdentifier(path), operationIDs)
+		doc := docFor(route.Method, route.Path)
 		operation := map[string]any{
 			"tags":        []string{tag},
-			"summary":     route.Method + " " + path,
+			"summary":     doc.Summary,
 			"operationId": operationID,
 			"responses":   responsesForRoute(route),
 		}
+		if doc.Description != "" {
+			operation["description"] = doc.Description
+		}
 
 		if params := parametersForRoute(route); len(params) > 0 {
 			operation["parameters"] = params