Add Dockerfile + fly.toml for single-host Fly deploy

.dockerignore

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+node_modules
+dist
+.git
+.github
+.vercel
+.env
+.env.*
+*.log
+coverage
+tests
+docs
+README.md
+*.md
+public

Dockerfile

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+# Multi-stage build for the CoTrackPro Voice Center.
+# Build tier compiles TypeScript; runtime tier ships only what's needed
+# to run the compiled output. Keeps the final image under ~200MB.
+
+# ── Build stage ──────────────────────────────────────────────────────────
+FROM node:20-alpine AS build
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY tsconfig*.json ./
+COPY src ./src
+COPY api ./api
+COPY scripts ./scripts
+RUN npm run build
+
+# Prune devDependencies so the runtime stage only copies what it needs.
+RUN npm prune --omit=dev
+
+# ── Runtime stage ────────────────────────────────────────────────────────
+FROM node:20-alpine AS runtime
+WORKDIR /app
+
+# tini is a tiny init that forwards signals correctly — important for
+# clean WebSocket shutdowns when Fly redeploys the machine.
+RUN apk add --no-cache tini
+
+COPY --from=build /app/package*.json ./
+COPY --from=build /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+
+ENV NODE_ENV=production
+ENV PORT=8080
+EXPOSE 8080
+
+USER node
+ENTRYPOINT ["/sbin/tini", "--"]
+CMD ["node", "dist/index.js"]

fly.toml

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+# fly.toml — single-host deployment for the CoTrackPro Voice Center.
+#
+# Both the HTTP webhook (/call/incoming, /health, /records, …) and the
+# Twilio Media Stream WebSocket (/call/stream) run on this one Fly
+# machine. SERVER_DOMAIN env var should match the public hostname Fly
+# assigns (default: <app>.fly.dev).
+#
+# `auto_stop_machines = false` keeps the machine always-on — voice calls
+# can't tolerate the ~30s cold start that scale-to-zero would introduce.
+
+app = "cotrackpro-talk"
+primary_region = "ord"
+
+[build]
+
+[env]
+  NODE_ENV = "production"
+  PORT = "8080"
+
+[http_service]
+  internal_port = 8080
+  force_https = true
+  auto_stop_machines = false
+  auto_start_machines = true
+  min_machines_running = 1
+  processes = ["app"]
+
+  # Health check used by Fly's load balancer to decide whether to route
+  # traffic. /health is a tiny JSON endpoint; 5s timeout is generous.
+  [[http_service.checks]]
+    interval = "30s"
+    timeout = "5s"
+    grace_period = "30s"
+    method = "GET"
+    path = "/health"
+
+# Single shared-CPU machine. Plenty for a few concurrent calls. Bump
+# to performance-1x or higher (memory_mb 1024+) if you start running
+# into OOM under load — call sessions hold a few hundred KB each.
+[[vm]]
+  cpu_kind = "shared"
+  cpus = 1
+  memory_mb = 512