Fix UUID cast in task creation, add kind test manifests

- Fix parent_task_id NULLIF cast to UUID type in INSERT query
- Fix itoa helper to use strconv.Itoa
- Handle AddReaction errors gracefully in webhook handler
- Add hack/kind/ manifests for local testing with kind cluster

hack/kind/manifests/test-resources.yaml

@@ -0,0 +1,67 @@
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: litellm-api-key
+  namespace: forgebot
+stringData:
+  api-key: "sk-test-dummy-key"
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: forgebot-api-token
+  namespace: forgebot
+stringData:
+  token: "test-token"
+---
+apiVersion: forgebot.unkin.net/v1alpha1
+kind: AgentPool
+metadata:
+  name: test-pool
+  namespace: forgebot
+spec:
+  model: claude-sonnet-4-20250514
+  endpoint: https://litellm.k8s.syd1.au.unkin.net
+  maxConcurrent: 2
+  image: busybox:latest
+  resources:
+    requests:
+      cpu: 100m
+      memory: 128Mi
+    limits:
+      cpu: 500m
+      memory: 512Mi
+  credentialSecretRef:
+    name: litellm-api-key
+  serviceAccountName: default
+---
+apiVersion: forgebot.unkin.net/v1alpha1
+kind: ProviderQueue
+metadata:
+  name: gitea-queue
+  namespace: forgebot
+spec:
+  provider: gitea
+  endpoint: http://forgebot-api.forgebot.svc.cluster.local:8000/api/v1
+  pollInterval: "10s"
+  credentialSecretRef:
+    name: forgebot-api-token
+---
+apiVersion: forgebot.unkin.net/v1alpha1
+kind: RepositoryBinding
+metadata:
+  name: test-repo
+  namespace: forgebot
+spec:
+  repository: unkin/test-repo
+  providerQueueRef: gitea-queue
+  agentPoolRef: test-pool
+  allowedUsers:
+    - unkinben
+  allowedCommands:
+    - plan
+    - review
+    - implement
+    - test
+    - fix