feat: Add opt-in telemetry and analytics system (VM-152)

cloudflare-worker/.env.example

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+# Cloudflare Worker Environment Configuration
+#
+# Copy this file to .env and fill in your values
+# These are only needed for local development with `wrangler dev`
+
+# Cloudflare Account ID
+# Find at: https://dash.cloudflare.com/ -> select account -> Account ID in sidebar
+CLOUDFLARE_ACCOUNT_ID=your_account_id_here
+
+# D1 Database ID
+# Get from: wrangler d1 create voicemode-telemetry
+CLOUDFLARE_DATABASE_ID=your_d1_database_id_here
+
+# KV Namespace ID
+# Get from: wrangler kv:namespace create "RATE_LIMITS"
+CLOUDFLARE_KV_NAMESPACE_ID=your_kv_namespace_id_here
+
+# Deployed Worker URL (after deployment)
+WORKER_URL=https://voicemode-telemetry.YOUR_SUBDOMAIN.workers.dev

cloudflare-worker/.gitignore

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+# Environment variables
+.env
+
+# Wrangler outputs
+.wrangler/
+worker/
+
+# Node modules (if using local development)
+node_modules/
+
+# IDE
+.vscode/
+.idea/
+
+# MacOS
+.DS_Store
+
+# Logs
+*.log