refactor: restructure project from bookmann to shelf

- Rename project from 'bookmann' to 'shelf'
- Move all backend/ contents to root level (flatten structure)
- Update Go module name from 'bookmann' to 'shelf'
- Update all import paths to use new 'shelf' module
- Update Dockerfile to work without backend/ subdirectory
- Update docker-compose.yml to use new structure and rename containers
- Update .gitignore for new file paths
- Update README.md with new project name and structure
- Regenerate database code with new module imports

README.md

@@ -1,6 +1,6 @@
-# 📚 Bookmann
+# 📚 Shelf
 
-A self-hosted ebook management system built with Go, PostgreSQL, HTMX, and Tailwind CSS (fully integrated into a single service) featuring multiple beautiful dark themes with Tokyo Night as default.
+A self-hosted ebook management system built with Go, PostgreSQL, HTMX, and Tailwind CSS featuring multiple beautiful dark themes with Tokyo Night as default. Smart folder scanning with real-time monitoring and rich EPUB metadata extraction.
 
 ## ✨ Features
 
@@ -35,7 +35,7 @@ A self-hosted ebook management system built with Go, PostgreSQL, HTMX, and Tailw
 docker-compose up --build
 ```
 
-3. Access the application at http://localhost:8765
+3. Access Shelf at http://localhost:8765
 
 ### Database
 
@@ -46,16 +46,15 @@ PostgreSQL runs on port 5432 with default credentials:
 
 ## Development
 
-### Backend
+### Development
 
 ```bash
-cd backend
 go mod tidy
 go run github.com/sqlc-dev/sqlc/cmd/sqlc@latest generate
 go run cmd/server/main.go
 ```
 
-The application uses Go HTML templates for server-side rendering with HTMX for dynamic interactions. Templates are located in `backend/templates/`.
+The application uses Go HTML templates for server-side rendering with HTMX for dynamic interactions. Templates are located in `templates/`.
 
 **✨ Enhanced Features:**
 - **Authentication**: Login/Register forms with multiple theme support at `/login` and `/register`
@@ -140,18 +139,20 @@ Use the included Bruno collection in the `bruno/` directory for testing the API:
 
 ```
 .
-├── backend/
-│   ├── cmd/server/          # Application entry point
-│   ├── internal/
-│   │   ├── config/          # Configuration management
-│   │   ├── database/        # Database connection and queries
-│   │   ├── handlers/        # HTTP handlers (auth + ebooks)
-│   │   └── services/        # Business logic services (ebook scanner)
-│   ├── migrations/          # Database migrations
-│   ├── templates/           # Go HTML templates with HTMX
-│   └── sqlc.yaml            # sqlc configuration
+├── cmd/server/              # Application entry point
+├── internal/
+│   ├── config/              # Configuration management
+│   ├── database/            # Database connection and queries
+│   ├── handlers/            # HTTP handlers (auth + ebooks)
+│   └── services/            # Business logic services (ebook scanner)
+├── migrations/              # Database migrations
+├── templates/               # Go HTML templates with HTMX
 ├── bruno/                   # Bruno API testing collection
-├── docker-compose.yml
+├── Dockerfile               # Docker build configuration
+├── docker-compose.yml       # Docker Compose setup
+├── go.mod                   # Go module definition
+├── go.sum                   # Go module checksums
+├── sqlc.yaml                # SQL code generation config
 └── README.md
 ```