feat: complete rewrite for gigabit-scale performance and SQLite storage

justfile

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+set shell := ["powershell", "-NoProfile", "-Command"]
+
+# Build the most optimized executable for modern CPUs
+build:
+    $env:GOAMD64="v3"; go build -ldflags="-s -w" -trimpath -o ncore-leaderboard.exe main.go
+    @echo "Build complete: ncore-leaderboard.exe"
+
+# Run the scraper
+run: build
+    ./ncore-leaderboard.exe
+
+# Cleanup all database and build artifacts
+clean:
+    if (Test-Path ncore-leaderboard.exe) { Remove-Item ncore-leaderboard.exe -ErrorAction SilentlyContinue }
+    if (Test-Path leaderboard.db) { Remove-Item leaderboard.db -ErrorAction SilentlyContinue }
+    if (Test-Path leaderboard.db-wal) { Remove-Item leaderboard.db-wal -ErrorAction SilentlyContinue }
+    if (Test-Path leaderboard.db-shm) { Remove-Item leaderboard.db-shm -ErrorAction SilentlyContinue }
+    @echo "Cleanup complete."
+
+# Query the database (Example: just query 100)
+query rank="1":
+    sqlite3 leaderboard.db "SELECT * FROM leaderboard WHERE rank = {{ rank }} LIMIT 1;"
+
+# Show top N from the database (Example: just top 5)
+top n="10":
+    sqlite3 leaderboard.db "SELECT * FROM leaderboard ORDER BY rank ASC LIMIT {{ n }};"
+
+# Formatting
+fmt:
+    go fmt ./...
+
+# Tidy dependencies
+tidy:
+    go mod tidy