refactor: Migrate to HyperFleet v2 architecture and cleanup codebase

This commit consolidates the migration to HyperFleet v2 architecture with the following changes:

- Remove v1 event-driven architecture components (events table, controllers, event DAOs)
- Cleanup unused CI/CD pipelines (.tekton, GitHub workflows)
- Remove legacy secrets, templates, and build scripts
- Standardize naming conventions (nodePool -> node_pool)
- Update documentation (CLAUDE.md, PREREQUISITES.md, README.md)
- Remove deprecated RHTAP integration files
- Simplify codebase structure for pure REST API approach

This migration removes the event-based orchestration in favor of Sentinel-driven
lifecycle management, aligning with the new HyperFleet architecture design.

fix: Update Dockerfile to use hyperfleet-api binary name

- Change COPY from hyperfleet to hyperfleet-api
- Update ENTRYPOINT to use /usr/local/bin/hyperfleet-api
- Update LABEL name to hyperfleet-api
- Update summary and description to HyperFleet API
- Add secrets directory to .gitignore

Author: yasun1

.claude/commands/generate-entity.md

@@ -404,7 +404,7 @@ go build -o /tmp/hyperfleet ./cmd/hyperfleet
 # Run database migrations
 make db/teardown
 make db/setup
-./hyperfleet migrate
+./hyperfleet-api migrate
 
 # Run integration tests
 make test-integration

.github/workflows/rhhyperfleet-parser.yml

@@ -30,7 +30,7 @@
 /coverage
 
 # Ignore built binaries
-/hyperfleet
+/hyperfleet-api
 
 # Ignore generated templates
 /templates/*-template.json
@@ -41,8 +41,8 @@
 # Ignore IntelliJ config
 .idea/
 
-# Don't push the testing password file
-secrets/db.password
+# Ignore secrets directory
+secrets
 
 # Ignore vendor directory
 /vendor/