Fix multi-copy car handling: track all configs per guid and add copy count

- Change owned_configs from HashMap<String, String> to HashMap<String, Vec<String>>
  to capture all configs across copies (previously last-write-wins lost data)
- Add copy_count field to MyCarsData and CarCounts for wishlist copy-coverage logic
- Fix improve.csv to exclude already-owned final configs as targets (e.g., Fiat
  Campagnola 1974 now targets 332 instead of already-owned 323)
- Fix wishlist to check all owned configs for exact-match and final-build detection
- Fix trash to check all configs for final-build-not-best detection
- Update all tests for new Vec type and add multi-copy improve test

src/commands/mod.rs

@@ -57,7 +57,6 @@ pub async fn run_analysis(
     let ctx = AnalysisContext::new();
     let owned = Arc::new(my_data.owned.clone());
     let car_list = parse_all_times(owned, &ctx, cars_db_path, times_dir).await?;
-    // Move only owned_configs; construct a new MyCarsData to transfer ownership.
-    let counts = compute_car_counts(&ctx, car_list, my_data.owned_configs.clone());
+    let counts = compute_car_counts(&ctx, car_list, my_data.owned_configs.clone(), my_data.copy_count.clone());
     Ok((ctx, counts))
 }