feat(firecrawl): Add ArgoCD Application manifest for GitOps deployment

- Add application.yaml for Firecrawl ArgoCD management
- Wave 20 (applications tier)
- Automated sync with prune and selfHeal enabled
- Manages all resources in cluster/applications/firecrawl/
- Remediates Day 5 manual deployment (kubectl apply -> GitOps)

cluster/applications/firecrawl/application.yaml

@@ -0,0 +1,34 @@
+# ------------------------------------------------------------------------------
+# Application: firecrawl
+# Wave 20 — applications tier
+# AI-powered web scraping and crawling service with Redis, PostgreSQL, Playwright
+# ------------------------------------------------------------------------------
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: firecrawl
+  namespace: argocd
+  labels:
+    app.kubernetes.io/name: firecrawl
+    app.kubernetes.io/part-of: mk-labs
+  annotations:
+    argocd.argoproj.io/sync-wave: "20"  # Wave 20 — applications tier
+spec:
+  project: default
+  source:
+    repoURL: https://gitea.mk-labs.cloud/rblundon/homelab.git
+    targetRevision: main
+    path: cluster/applications/firecrawl
+    directory:
+      recurse: false
+      exclude: application.yaml  # prevent self-reference loop
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: firecrawl
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - ApplyOutOfSyncOnly=true