refactor: rename binary from quoteforge to qfs

- Rename cmd/server to cmd/qfs for shorter binary name
- Update all documentation references (README, CLAUDE.md, etc.)
- Update build commands to output bin/qfs
- Binary name now matches directory name

Usage:
  go run ./cmd/qfs              # Development
  go build -o bin/qfs ./cmd/qfs # Production

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -82,7 +82,7 @@ auth:
 ### 3. Миграции базы данных
 
 ```bash
-go run ./cmd/server -migrate
+go run ./cmd/qfs -migrate
 ```
 
 ### 4. Импорт метаданных компонентов
@@ -95,11 +95,11 @@ go run ./cmd/importer
 
 ```bash
 # Development
-go run ./cmd/server
+go run ./cmd/qfs
 
 # Production
-CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
-./bin/quoteforge
+CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/qfs ./cmd/qfs
+./bin/qfs
 ```
 
 Приложение будет доступно по адресу: http://localhost:8080
@@ -209,13 +209,13 @@ go run ./cmd/cron -job=update-popularity
 
 ```bash
 # Запуск в режиме разработки (hot reload)
-go run ./cmd/server
+go run ./cmd/qfs
 
 # Запуск тестов
 go test ./...
 
 # Сборка для Linux
-CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
+CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/qfs ./cmd/qfs
 ```
 
 ## Переменные окружения