build: migrate to new docker-first workflow

.dockerignore

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+node_modules
+.git
+.env
+db
+docs
+*.webm

Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install dependencies
+COPY server/package*.json ./server/
+RUN cd server && npm install --production
+
+# Copy app source
+COPY server/ ./server/
+COPY public/ ./public/
+COPY shared/ ./shared/
+
+# Start server
+WORKDIR /app/server
+EXPOSE 3000
+CMD ["npm", "start"]