feat(was-lib): add /tool-manifest/{categoryKey} endpoint for filtered manifest

dap-was-lib/src/main/java/io/shinhanlife/dap/lib/manifest/ToolManifestService.java

@@ -43,12 +43,17 @@ public class ToolManifestService {
     }
 
     public ToolManifestResponse currentManifest() {
+        return currentManifest(null);
+    }
+
+    public ToolManifestResponse currentManifest(String categoryKey) {
         String bundleId = properties.getManifest() == null ? null : properties.getManifest().getBundleId();
         if (bundleId == null || bundleId.isBlank()) {
             throw new IllegalStateException("mcp.manifest.bundle-id must be configured");
         }
 
         List<ToolManifestItem> tools = toolSupplier.get().stream()
+                .filter(tool -> categoryKey == null || categoryKey.equals(tool.getCategoryKey()))
                 .map(this::toManifestItem)
                 .sorted(Comparator.comparing(ToolManifestItem::name))
                 .toList();

dap-was-lib/src/main/java/io/shinhanlife/dap/mcc/presentation/ToolManifestController.java

@@ -8,6 +8,7 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestHeader;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.PathVariable;
 
 /** Read-only Tool Service manifest endpoint for MCP background discovery. */
 @RestController
@@ -22,7 +23,17 @@ public class ToolManifestController {
     @GetMapping(value = "/tool-manifest", produces = MediaType.APPLICATION_JSON_VALUE)
     public ResponseEntity<ToolManifestResponse> getManifest(
             @RequestHeader(value = HttpHeaders.IF_NONE_MATCH, required = false) String ifNoneMatch) {
-        ToolManifestResponse manifest = toolManifestService.currentManifest();
+        return handleManifest(toolManifestService.currentManifest(), ifNoneMatch);
+    }
+
+    @GetMapping(value = "/tool-manifest/{categoryKey}", produces = MediaType.APPLICATION_JSON_VALUE)
+    public ResponseEntity<ToolManifestResponse> getManifestByCategory(
+            @PathVariable("categoryKey") String categoryKey,
+            @RequestHeader(value = HttpHeaders.IF_NONE_MATCH, required = false) String ifNoneMatch) {
+        return handleManifest(toolManifestService.currentManifest(categoryKey), ifNoneMatch);
+    }
+
+    private ResponseEntity<ToolManifestResponse> handleManifest(ToolManifestResponse manifest, String ifNoneMatch) {
         String eTag = '"' + manifest.revision() + '"';
         if (eTag.equals(ifNoneMatch)) {
             return ResponseEntity.status(304).eTag(eTag).build();