firecrawl: Day 4 - Add ExternalSecret for 1Password integration

- Add ExternalSecret manifest to sync firecrawl secrets from 1Password
- Configure POSTGRES_PASSWORD and BULL_AUTH_KEY from mk-labs vault
- Add comprehensive SECRETS_SETUP.md documentation
- Verified ExternalSecrets Operator successfully synced secrets
- All 18 deployment manifests validated with dry-run

Status: firecrawl-secrets Secret created and populated correctly

cluster/applications/firecrawl/SECRETS_SETUP.md

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+# Firecrawl Secrets for 1Password
+
+## Action Required: Manual Secret Creation in 1Password
+
+The 1Password Connect token is READ-ONLY for security. These secrets must be manually added to 1Password.
+
+### Vault Information
+- **Vault Name:** mk-labs
+- **Vault ID:** mnefk7klz35qqvv2eucygh4pzm
+
+### Item to Create
+- **Item Name:** firecrawl
+- **Item Type:** Server / API Credential
+
+### Fields to Add
+
+#### 1. postgres-password
+- **Label:** postgres-password
+- **Type:** Password (concealed)
+- **Value:** `ll1fTJSer8h0Bwq7PBmkTcRbAlFKGzbV`
+- **Purpose:** PostgreSQL database authentication
+
+#### 2. bull-auth-key  
+- **Label:** bull-auth-key
+- **Type:** Password (concealed)
+- **Value:** `fCHhkTNeplAwI2scqGo0C4cwJGA33FBpmyIVxlbzkodRbFKy5WlroxJeezjYg1UQ`
+- **Purpose:** Redis Bull queue admin UI authentication
+
+## Instructions
+
+1. Open 1Password desktop app or web interface
+2. Navigate to the "mk-labs" vault
+3. Create a new item:
+   - Name: `firecrawl`
+   - Type: `Server` or `Password`
+4. Add custom fields:
+   - Field 1: Label = `postgres-password`, Value = (32-char password above)
+   - Field 2: Label = `bull-auth-key`, Value = (64-char key above)
+5. Save the item
+
+## Verification
+
+After creating the item in 1Password, verify it's accessible:
+
+```bash
+# Port-forward to 1Password Connect (if not already running)
+kubectl port-forward -n onepassword-connect svc/onepassword-connect 8080:8080 &
+
+# Test retrieval (read-only access should work)
+curl -s -H "Authorization: Bearer *** kubectl get secret -n onepassword-connect connect-token -o jsonpath='{.data.token}' | base64 -d)" \
+  "http://localhost:8080/v1/vaults/mnefk7klz35qqvv2eucygh4pzm/items" | \
+  jq -r '.[] | select(.title == "firecrawl") | .title'
+```
+
+Expected output: `firecrawl`
+
+## Next Steps
+
+Once the item is created in 1Password, the ExternalSecret manifest will automatically sync these values to Kubernetes.

cluster/applications/firecrawl/externalsecret.yaml

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+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: firecrawl-secrets
+  namespace: firecrawl
+  labels:
+    app.kubernetes.io/name: firecrawl
+    app.kubernetes.io/component: secrets
+    app.kubernetes.io/part-of: firecrawl
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: onepassword-connect
+  target:
+    name: firecrawl-secrets
+    creationPolicy: Owner
+    template:
+      engineVersion: v2
+      type: Opaque
+      data:
+        # PostgreSQL database password
+        POSTGRES_PASSWORD: "{{ .postgresPassword }}"
+        # Redis Bull queue admin UI authentication key
+        BULL_AUTH_KEY: "{{ .bullAuthKey }}"
+  data:
+    - secretKey: postgresPassword
+      remoteRef:
+        key: firecrawl
+        property: postgres-password
+    - secretKey: bullAuthKey
+      remoteRef:
+        key: firecrawl
+        property: bull-auth-key