feat: add vendor InfrastructureController for platform:admin

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/java/net/siegeln/cameleer/saas/vendor/InfrastructureController.java

@@ -0,0 +1,57 @@
+package net.siegeln.cameleer.saas.vendor;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/vendor/infrastructure")
+@PreAuthorize("hasAuthority('SCOPE_platform:admin')")
+public class InfrastructureController {
+
+    private final InfrastructureService infraService;
+
+    public InfrastructureController(InfrastructureService infraService) {
+        this.infraService = infraService;
+    }
+
+    public record InfraOverviewResponse(
+            InfrastructureService.PostgresOverview postgres,
+            InfrastructureService.ClickHouseOverview clickhouse) {}
+
+    @GetMapping
+    public ResponseEntity<InfraOverviewResponse> overview() {
+        return ResponseEntity.ok(new InfraOverviewResponse(
+                infraService.getPostgresOverview(),
+                infraService.getClickHouseOverview()));
+    }
+
+    @GetMapping("/postgres")
+    public ResponseEntity<Map<String, Object>> postgres() {
+        return ResponseEntity.ok(Map.of(
+                "overview", infraService.getPostgresOverview(),
+                "tenants", infraService.getPostgresTenantStats()));
+    }
+
+    @GetMapping("/postgres/{slug}")
+    public ResponseEntity<List<InfrastructureService.TableStats>> postgresDetail(
+            @PathVariable String slug) {
+        return ResponseEntity.ok(infraService.getPostgresTenantDetail(slug));
+    }
+
+    @GetMapping("/clickhouse")
+    public ResponseEntity<Map<String, Object>> clickhouse() {
+        return ResponseEntity.ok(Map.of(
+                "overview", infraService.getClickHouseOverview(),
+                "tenants", infraService.getClickHouseTenantStats()));
+    }
+
+    @GetMapping("/clickhouse/{tenantId}")
+    public ResponseEntity<List<InfrastructureService.ChTableStats>> clickhouseDetail(
+            @PathVariable String tenantId) {
+        return ResponseEntity.ok(infraService.getClickHouseTenantDetail(tenantId));
+    }
+}