Consolidate all Helm build and release tasks into single workflow

- Removed build-helm job from build.yml (Docker builds only now)
- Created comprehensive helm-release.yml that handles:
  - Development builds on main branch pushes (with dev suffix)
  - Release builds on version tags (v*.*.*)
  - Manual releases via workflow_dispatch
  - PR linting without publishing
- Added intelligent version detection:
  - Development versions get timestamp suffix
  - Release versions use clean semver
  - Manual dispatch can specify custom version
- Improved release process with proper Gitea API integration
- Added conditional release creation only for tagged versions
- Updated README to document the new workflow structure
- Separated concerns: build.yml for Docker, helm-release.yml for Helm

README.md

@@ -89,12 +89,20 @@ docker run -p 8001:8000 api-app
 
 ### Automated Pipeline
 
-The `.gitea/workflows/build.yml` pipeline automatically:
+The CI/CD workflows automatically:
+
+**`.gitea/workflows/build.yml`**:
 1. Builds Docker images for both applications
 2. Pushes to Gitea container registry
 3. Tags images with branch name
-4. Packages and publishes Helm chart
-5. Implements layer caching for faster builds
+4. Implements layer caching for faster builds
+
+**`.gitea/workflows/helm-release.yml`**:
+1. Packages Helm charts on every main branch push
+2. Creates development versions for main branch builds
+3. Creates release versions for tags (v*.*.*)
+4. Publishes charts to Gitea Helm registry
+5. Creates GitHub releases for tagged versions
 
 **Triggers:**
 - Any branch push (Docker images)