feat(pipeline): Migration from Gitea pipeline to act runner

CLAUDE.md

@@ -54,7 +54,7 @@ The application follows a **three-tier architecture**:
 #### Infrastructure
 - **Containerization**: Docker
 - **Orchestration**: Docker Compose (dev and prod configurations)
-- **CI/CD**: Gitea workflows (`.gitea/workflows/pipeline.yaml`)
+- **CI/CD**: Local act execution with GitHub Actions format (`.github/workflows/pipeline.yaml`)
 
 ---
 
@@ -475,6 +475,7 @@ Main config in `src/main/resources/application.yaml`:
 - pnpm 10.11.0+
 - Java 21
 - PostgreSQL (or use Docker)
+- act (for running CI/CD workflows locally)
 
 **Frontend**:
 ```bash
@@ -501,6 +502,28 @@ docker-compose -f deployment/docker-compose-dev.yaml up
 docker-compose -f deployment/docker-compose-prod.yaml up
 ```
 
+### CI/CD with Act
+
+Workflows are executed locally using nektos/act:
+
+```bash
+# List workflows
+act -l
+
+# Run specific jobs
+act -j frontend
+act -j backend
+
+# Run all jobs
+act push
+
+# Run with secrets (for Docker push/deploy)
+act push --secret-file .secrets
+
+# Dry run
+act -n
+```
+
 ---
 
 ## Testing
@@ -532,7 +555,8 @@ docker-compose -f deployment/docker-compose-prod.yaml up
 
 - OpenAPI Specification: `api/legalconsenthub.yml`
 - Thymeleaf Template: `legalconsenthub-backend/src/main/resources/templates/application_form_template.html`
-- CI/CD Pipeline: `.gitea/workflows/pipeline.yaml`
+- CI/CD Pipeline: `.github/workflows/pipeline.yaml`
+- Act Configuration: `.actrc` and `.secrets.example`
 - Database Management Script: `manage-db.sh`
 - Test Data: `testdata.json`
 - IT System Config: `it-system.json`