[FEATURE] Configure language for auto-generated session/chat titles

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Currently, Claude Code automatically generates session titles in English (e.g., "Complete infrastructure analysis an..."), even when:

• The project's CLAUDE.md instructs Claude to always respond in a specific language (e.g., Portuguese)
• The entire conversation is conducted in a non-English language

This creates an inconsistency: the conversation is in Portuguese, but the session list shows English titles, forcing users to manually rename every session.

Proposed Solution

Add a configuration option in settings.json:

{
  "sessionTitleLanguage": "pt-BR"
}
Or alternatively, respect the language already declared in CLAUDE.md when generating titles.

### Alternative Solutions

_No response_

### Priority

Critical - Blocking my work

### Feature Category

CLI commands and flags

### Use Case Example

_No response_

### Additional Context

_No response_