chore: add Justfile, apply clippy fixes, add frontend type checking

- Add Justfile with comprehensive development workflow commands (check,
lint, build, docker, etc.)
- Add @astrojs/check and typescript dependencies for frontend type
checking

Justfile

@@ -0,0 +1,109 @@
+# Variables
+image_name := "dynamic-preauth"
+container_name := "dynamic-preauth-dev"
+port := "5800"
+
+# Default recipe
+default:
+    @just --list
+
+# Run all checks (format, clippy, frontend)
+check: format-check lint frontend-check
+    @echo "All checks passed!"
+
+# Format all Rust code
+format:
+    @echo "Formatting code..."
+    cargo fmt --all
+    cargo fmt --manifest-path demo/Cargo.toml --all
+
+# Check formatting without modifying
+format-check:
+    @echo "Checking formatting..."
+    cargo fmt --all -- --check
+    cargo fmt --manifest-path demo/Cargo.toml --all -- --check
+
+# Lint with clippy
+lint:
+    @echo "Running clippy..."
+    cargo clippy --all-targets --all-features -- -D warnings
+    cargo clippy --manifest-path demo/Cargo.toml --all-targets --all-features -- -D warnings
+
+# Frontend type check
+frontend-check:
+    @echo "Checking frontend..."
+    pnpm --dir frontend astro check
+
+# Build frontend
+frontend-build:
+    @echo "Building frontend..."
+    pnpm --dir frontend build
+
+# Development server with hot reload
+dev:
+    @echo "Starting development server..."
+    cargo watch -x run
+
+# Simple development run (no hot reload)
+run:
+    @echo "Starting server..."
+    cargo run
+
+# Build release
+build:
+    @echo "Building release..."
+    cargo build --release
+
+# Build demo executables
+build-demo:
+    @echo "Building demo executables..."
+    cargo build --manifest-path demo/Cargo.toml --release
+
+# Security audit
+audit:
+    @echo "Running security audit..."
+    cargo audit
+    cargo audit --file demo/Cargo.lock
+
+# Build Docker image
+docker-build:
+    @echo "Building Docker image..."
+    docker build -t {{image_name}}:latest .
+
+# Run Docker container
+docker-run: docker-build
+    @echo "Running Docker container..."
+    docker run --rm -d --name {{container_name}} -p {{port}}:{{port}} -e PORT={{port}} {{image_name}}:latest
+    @echo "Container started at http://localhost:{{port}}"
+
+# Stop Docker container
+docker-stop:
+    @echo "Stopping Docker container..."
+    docker stop {{container_name}} || true
+
+# Docker logs
+docker-logs:
+    docker logs {{container_name}}
+
+# Follow Docker logs
+docker-logs-follow:
+    docker logs -f {{container_name}}
+
+# Clean Docker artifacts
+docker-clean: docker-stop
+    @echo "Cleaning Docker artifacts..."
+    docker rmi {{image_name}}:latest || true
+
+# Clean cargo artifacts
+clean:
+    @echo "Cleaning cargo artifacts..."
+    cargo clean
+    cargo clean --manifest-path demo/Cargo.toml
+
+# Full CI pipeline
+ci: format-check lint frontend-check build docker-build
+    @echo "CI pipeline completed!"
+
+# Quick development check
+quick: format lint
+    @echo "Quick check completed!"