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.

tests/verify-model-priority-simple.js

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+/**
+ * Simple test to verify model loading priority messages
+ */
+
+import { BrainyData } from '../dist/unified.js'
+
+console.log('Testing model loading priority system...\n')
+
+const db = new BrainyData({
+  forceMemoryStorage: true,
+  dimensions: 512,
+  skipEmbeddings: true  // Skip embeddings to avoid model loading for this test
+})
+
+console.log('Initializing BrainyData with skipEmbeddings=true...')
+await db.init()
+
+console.log('\n✅ BrainyData initialized successfully (embeddings skipped)')
+
+// Now test with embeddings enabled to see the warnings
+console.log('\n---')
+console.log('Now testing with embeddings enabled to see model loading messages...\n')
+
+const db2 = new BrainyData({
+  forceMemoryStorage: true,
+  dimensions: 512,
+  skipEmbeddings: false
+})
+
+try {
+  await db2.init()
+  console.log('\n✅ Model loaded successfully')
+} catch (error) {
+  console.log('\n❌ Model loading failed (expected in test environment without actual models)')
+  console.log(`   Error: ${error.message.split('\n')[0]}`)
+}
+
+console.log('\n---')
+console.log('Check the output above to verify:')
+console.log('1. "Checking for @soulcraft/brainy-models package..." appears')
+console.log('2. Warning about falling back to remote loading appears')
+console.log('3. Installation suggestion for @soulcraft/brainy-models appears')
+
+process.exit(0)