Allow per-instance custom palettes and dynamic methods

[hbisneto]

Problem: Users cannot define custom named colors without subclassing or modifying the module.

Why it matters: Branding and user-defined themes require extensibility.

Proposed solution: Accept an optional palette dict in Console.__init__ mapping names to ANSI codes; dynamically create methods (console.myred()) via __getattr__. Validate codes on init.

Notes: Cache dynamic methods; avoid conflicts with built-ins. Document that palette overrides are per-instance only.