refactor: simplify build system and improve model loading flexibility

- Remove Rollup bundling in favor of direct TypeScript compilation
- Move from bundled models to dynamic model loading with configurable paths
- Add Docker deployment examples and documentation
- Implement robust model loader with fallback mechanisms
- Update storage adapters for better cross-environment compatibility
- Add comprehensive tests for model loading and package installation
- Simplify package.json scripts and remove complex build configurations
- Clean up deprecated demo files and old bundling scripts

BREAKING CHANGE: Models are no longer bundled with the package. They are now loaded dynamically from CDN or custom paths.

examples/docker-deployment/Dockerfile

@@ -0,0 +1,66 @@
+# Multi-stage Dockerfile for Brainy with embedded models
+FROM node:24-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies including @soulcraft/brainy-models
+RUN npm ci --only=production
+
+# Copy application code
+COPY . .
+
+# Create models directory and copy models from node_modules
+# This ensures models are included even when node_modules is ignored
+RUN mkdir -p /app/models && \
+    if [ -d "./node_modules/@soulcraft/brainy-models" ]; then \
+        echo "Copying models from @soulcraft/brainy-models..."; \
+        cp -r ./node_modules/@soulcraft/brainy-models/models/* /app/models/ || \
+        cp -r ./node_modules/@soulcraft/brainy-models/* /app/models/ || \
+        echo "Models structure may vary, copying entire package"; \
+    else \
+        echo "⚠️ @soulcraft/brainy-models not found - will fall back to remote loading"; \
+    fi
+
+# Production stage
+FROM node:24-alpine AS production
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install only production dependencies (without @soulcraft/brainy-models to save space)
+RUN npm ci --only=production --omit=optional && \
+    npm cache clean --force
+
+# Copy application code
+COPY . .
+
+# Copy models from builder stage
+COPY --from=builder /app/models /app/models
+
+# Set environment variable to use custom models path
+ENV BRAINY_MODELS_PATH=/app/models
+
+# Create non-root user
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S brainy -u 1001
+
+# Change ownership of the app directory
+RUN chown -R brainy:nodejs /app
+USER brainy
+
+# Expose port (adjust as needed)
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD node -e "console.log('Health check passed')" || exit 1
+
+# Start the application
+CMD ["node", "dist/your-app.js"]