Feat: Adding swagger advanced feature

[gustavodetoni]

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

Problem/Feature

This PR adds Swagger support as a new advanced feature for generated Go Blueprint projects. Users can now enable Swagger documentation during project creation with --advanced --feature swagger

Related to #219.

Description of Changes:

• Added swagger to the advanced feature flags, CLI completions, and interactive advanced feature prompt
• Added Swaggo integration for all supported frameworks, including Gin, Echo, Fiber, Chi, Gorilla/Mux, HttpRouter, and the standard library
• Added Swagger route generation at /swagger/index.html for generated projects
• Added Swaggo annotations for the default / endpoint and database /health endpoint when a database driver is selected
• Added automatic Swagger docs generation during project creation
• Added a make swagger target to regenerate Swagger documentation
• Updated README and documentation pages to include the new Swagger advanced feature

CLI example

go-blueprint create \
  --name myapp \
  --framework chi \
  --driver postgres \
  --advanced \
  --feature swagger \
  --feature docker \
  --git commit

Local verification

• go test ./... and git diff --check pass
• Non-interactive scaffold verified with standard-library and gin using --advanced --feature swagger
• Generated projects contain docs/docs.go, docs/swagger.json, and docs/swagger.yaml
• Generated Swagger route is available at /swagger/index.html.
• Generated projects build successfully with go build ./cmd/api and tests pass with go test ./....

Checklist

• I have self-reviewed the changes being requested
• I have updated the documentation (check issue ticket 📋Update documentation if the PR introduces a new feature!📋 #218)