feat: Add Render.com deployment support with production data

Render Configuration:
- render.yaml for declarative deployment
- requirements-dashboard.txt (lightweight deps for cloud)
- Updated .streamlit/config.toml for production
- Updated app.py to auto-detect production vs local data

Production Data:
- Added data/production/test-07/ with 30 real call analyses
- Updated .gitignore to allow data/production/

Documentation:
- Added Render.com section to DEPLOYMENT.md with step-by-step guide

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

requirements-dashboard.txt

@@ -0,0 +1,16 @@
+# ============================================
+# CXInsights Dashboard - Minimal Requirements
+# ============================================
+# For Render.com deployment (lightweight)
+# ============================================
+
+# === Dashboard Core ===
+streamlit>=1.29.0,<2.0.0
+plotly>=5.18.0,<6.0.0
+pandas>=2.1.0,<3.0.0
+
+# === Exports ===
+openpyxl>=3.1.0,<4.0.0
+
+# === Data Handling ===
+orjson>=3.9.0,<4.0.0