Fix: add explicit names to @RequestParam and @PathVariable annotations

to prevent runtime exception

Spring Framework 6+ requires parameter name reflection or explicitly
named annotations.
This commit adds missing `name = "..."` attributes to all @RequestParam
and @PathVariable
usages across controller classes.

Affected controllers:
- OwnerController
- PetController
- VisitController
- VetController

This change prevents the following runtime error:
IllegalArgumentException: Name for argument of type [int] not
specified...

The application now builds and runs cleanly with `./gradlew clean
build`.

Signed-off-by: nirsa <islandtim@naver.com>

src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java

@@ -90,7 +90,7 @@ class OwnerController {
 	}
 
 	@GetMapping("/owners")
-	public String processFindForm(@RequestParam(defaultValue = "1") int page, Owner owner, BindingResult result,
+	public String processFindForm(@RequestParam(name="page", defaultValue = "1") int page, Owner owner, BindingResult result,
 			Model model) {
 		// allow parameterless GET request for /owners to return all records
 		if (owner.getLastName() == null) {

src/main/java/org/springframework/samples/petclinic/owner/PetController.java

@@ -119,12 +119,12 @@ class PetController {
 	}
 
 	@GetMapping("/pets/{petId}/edit")
-	public String initUpdateForm() {
+	public String initUpdateForm(@PathVariable("petId") int petId) {
 		return VIEWS_PETS_CREATE_OR_UPDATE_FORM;
 	}
 
 	@PostMapping("/pets/{petId}/edit")
-	public String processUpdateForm(Owner owner, @Valid Pet pet, BindingResult result,
+	public String processUpdateForm(@PathVariable("petId") int petId, Owner owner, @Valid Pet pet, BindingResult result,
 			RedirectAttributes redirectAttributes) {
 
 		String petName = pet.getName();

src/main/java/org/springframework/samples/petclinic/owner/VisitController.java

@@ -85,7 +85,7 @@ class VisitController {
 	// Spring MVC calls method loadPetWithVisit(...) before processNewVisitForm is
 	// called
 	@PostMapping("/owners/{ownerId}/pets/{petId}/visits/new")
-	public String processNewVisitForm(@ModelAttribute Owner owner, @PathVariable int petId, @Valid Visit visit,
+	public String processNewVisitForm(@ModelAttribute Owner owner, @PathVariable("petId") int petId, @Valid Visit visit,
 			BindingResult result, RedirectAttributes redirectAttributes) {
 		if (result.hasErrors()) {
 			return "pets/createOrUpdateVisitForm";

src/main/java/org/springframework/samples/petclinic/vet/VetController.java

@@ -42,7 +42,7 @@ class VetController {
 	}
 
 	@GetMapping("/vets.html")
-	public String showVetList(@RequestParam(defaultValue = "1") int page, Model model) {
+	public String showVetList(@RequestParam(name="page", defaultValue = "1") int page, Model model) {
 		// Here we are returning an object of type 'Vets' rather than a collection of Vet
 		// objects so it is simpler for Object-Xml mapping
 		Vets vets = new Vets();