feat(cliproxy): add Claude Opus 4.7 support

Adds Claude Opus 4.7 as a new model to the AGY (Antigravity) and Claude
provider catalogs, with pricing, Cursor IDE support, and updated defaults
across the codebase.

- Add claude-opus-4-7-thinking and claude-opus-4-7 to AGY catalog
  (defaultModel bumped to claude-opus-4-7-thinking)
- Add claude-opus-4-7 entry to Claude provider catalog
- Register claude-opus-4-7-thinking fork alias in CLIProxy config
  (CLIPROXY_CONFIG_VERSION bumped 17 -> 18)
- Add pricing for claude-opus-4-7 and claude-opus-4-7-thinking
  ($5/$25 per million, matching Opus 4.6)
- Add claude-4.7-opus and claude-4.7-opus-fast-mode to Cursor catalog
- Update ANTHROPIC_DEFAULT_OPUS_MODEL in base-claude settings to 4.7
- Update Droid adapter and code-reviewer fallback models to 4.7
- Update unit tests for model-catalog and model-pricing

Opus 4.6 is retained as a supported fallback in both catalogs.

Built [OnSteroids](https://onsteroids.ai)

scripts/code-reviewer.ts

@@ -26,7 +26,7 @@ interface PRContext {
 // Config
 const MAX_DIFF_LINES = 10000;
 const CLIPROXY_URL = process.env.CLIPROXY_URL || 'http://localhost:8317';
-const MODEL = process.env.REVIEW_MODEL || 'claude-opus-4-6-thinking';
+const MODEL = process.env.REVIEW_MODEL || 'claude-opus-4-7-thinking';
 
 // System prompt for code review - new style
 const CODE_REVIEWER_SYSTEM_PROMPT = `You are the CCS AGY Code Reviewer, an expert AI assistant reviewing pull requests for the CCS CLI project.