Simplify CI/CD pipeline with CronJob-based build trigger

- Add CronJob that polls git repository every 2 minutes for changes
- Automatically triggers Kaniko build jobs when new commits detected
- Images tagged with both 'latest' and 'v1.0.<commit-sha>' for versioning
- Remove complex Tekton/Flux image automation dependencies
- Add comprehensive simple CI/CD setup documentation

This provides a reliable, simple CI/CD pipeline:
1. Push code to Gitea
2. CronJob detects changes within 2 minutes
3. Kaniko builds and pushes to Harbor
4. Flux deploys latest image automatically

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

flux-helmrelease.yaml

@@ -17,5 +17,5 @@ spec:
     image:
       registry: images.caffeinetux.com
       repository: apps/neon-vortex
-      tag: latest # {"$imagepolicy": "flux-system:neon-vortex:tag"}
+      tag: latest
       pullPolicy: Always