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/operator-deployment.yaml

@@ -0,0 +1,35 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: forgebot-operator
+  namespace: forgebot
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: forgebot-operator
+  template:
+    metadata:
+      labels:
+        app: forgebot-operator
+    spec:
+      serviceAccountName: forgebot-operator
+      containers:
+        - name: operator
+          image: forgebot-operator:dev
+          imagePullPolicy: Never
+          args:
+            - --metrics-bind-address=:8080
+            - --health-probe-bind-address=:8081
+          ports:
+            - containerPort: 8080
+              name: metrics
+            - containerPort: 8081
+              name: health
+          readinessProbe:
+            httpGet:
+              path: /readyz
+              port: 8081
+            initialDelaySeconds: 5
+            periodSeconds: 5