refactor: simplify stealth args — rely on binary auto-generation (v14+)

Binary v14+ auto-generates hardware concurrency, device memory, screen
dimensions, and window size from the fingerprint seed. Remove these
explicit flags from Python/JS wrapper defaults and update README:

- Remove 5 flags from get_default_stealth_args() in both wrappers
- Move hardware-concurrency, device-memory, screen-width, screen-height
  to the Additional Flags table with auto-generated defaults documented
- Update code examples to use --fingerprint instead of --window-size
- Simplify fingerprint defaults table to show only wrapper-set flags

js/README.md

@@ -72,7 +72,7 @@ const browser = await launch({ headless: false });
 
 // Extra Chrome args
 const browser = await launch({
-  args: ['--window-size=1920,1080'],
+  args: ['--fingerprint=12345'],
 });
 
 // With timezone and locale (sets --fingerprint-timezone and --lang binary flags)