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>

render.yaml

@@ -0,0 +1,22 @@
+# ============================================
+# Render.com Deployment Configuration
+# ============================================
+# CXInsights Streamlit Dashboard
+# ============================================
+
+services:
+  - type: web
+    name: cxinsights-dashboard
+    runtime: python
+    region: frankfurt  # EU region, change to oregon for US
+    plan: free  # or starter for production
+    buildCommand: pip install -r requirements-dashboard.txt
+    startCommand: streamlit run dashboard/app.py --server.port $PORT --server.address 0.0.0.0 --server.headless true
+    envVars:
+      - key: PYTHON_VERSION
+        value: "3.11.0"
+      - key: STREAMLIT_SERVER_HEADLESS
+        value: "true"
+      - key: STREAMLIT_BROWSER_GATHER_USAGE_STATS
+        value: "false"
+    # healthCheckPath: /_stcore/health  # Streamlit health endpoint