Upgrade README to product-grade with 7-step analysis showcase and real report format

- Redesign README with polished badges, structured report preview, collapsible config sections
- Update sample report to match actual 7-step deep analysis output (trade signal, event positions, long/short, info gap, historical pattern, asymmetry score)
- Add new whale trade report (US x Iran diplomatic meeting)
- Update signals database with latest data

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/services/llm_analyzer.py

@@ -275,7 +275,7 @@ class LLMAnalyzer:
                 call_kwargs = {
                     "model": self.settings.llm_model,
                     "messages": messages,
-                    "max_tokens": 4096,
+                    "max_tokens": 8192,
                 }
                 if tool_schemas and not is_last_round:
                     call_kwargs["tools"] = tool_schemas