refactor: modular architecture with unified error handling and DashMap concurrency

- Break monolithic records.rs into commands/, output/, parsing/ modules
- Add lib.rs with shared types (AppError, Car, BestCarRecord, etc.)
- Replace Arc<Mutex<HashMap>> with DashMap for concurrent access
- Add unified AppError enum with thiserror
- Add configurable CLI paths (--my-cars, --cars-db, --times-dir, --tracks-db)
- Add serde deserialization for Car struct
- Add CSV escaping for fields with commas/quotes/newlines
- Fix track name splitting: split_once -> rsplit_once for _a handling
- Add integration tests, proptest property-based tests, and unit tests
- Add rustfmt.toml configuration
- Update documentation (API, ARCHITECTURE, DATA_STRUCTURES, README)

README.md

@@ -282,10 +282,11 @@ top_drives/
 
 ### Dependencies
 - **reqwest**: HTTP client for data fetching
-- **serde_json**: JSON parsing and serialization
-- **tokio**: Asynchronous runtime
+- **serde** / **serde_json**: JSON parsing and serialization (with `serde::Deserialize` derive for `Car`)
+- **tokio**: Asynchronous runtime (rt-multi-thread, macros, fs, sync, io-util)
 - **futures**: Async utility combinators
-- **once_cell**: Lazy static initialization
+- **clap**: CLI argument parsing (with derive macros)
+- **thiserror**: Ergonomic error type definitions
 
 ## 🔧 Development
 
@@ -325,6 +326,7 @@ struct BestCarRecord {
     config: String,    // Tune configuration
     time: f64,        // Track time
     owned: bool,      // Whether you own this car
+    prize: bool,      // Whether this is a prize car
     guid: String,     // Game identifier
 }
 ```