feat: implement Docker image optimization - reduces size from 2.6GB to ~200MB

- Add optimized database schema with embedded source code storage
- Create optimized rebuild script that extracts source at build time
- Implement optimized MCP server reading from pre-built database
- Add Dockerfile.optimized with multi-stage build process
- Create comprehensive documentation and testing scripts
- Demonstrate 92% size reduction by removing runtime n8n dependencies

The optimization works by:
1. Building complete database at Docker build time
2. Extracting all node source code into the database
3. Creating minimal runtime image without n8n packages
4. Serving everything from pre-built SQLite database

This makes n8n-MCP suitable for resource-constrained production deployments.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/database/schema-optimized.sql

@@ -0,0 +1,66 @@
+-- Optimized schema with source code storage for Docker optimization
+CREATE TABLE IF NOT EXISTS nodes (
+  node_type TEXT PRIMARY KEY,
+  package_name TEXT NOT NULL,
+  display_name TEXT NOT NULL,
+  description TEXT,
+  category TEXT,
+  development_style TEXT CHECK(development_style IN ('declarative', 'programmatic')),
+  is_ai_tool INTEGER DEFAULT 0,
+  is_trigger INTEGER DEFAULT 0,
+  is_webhook INTEGER DEFAULT 0,
+  is_versioned INTEGER DEFAULT 0,
+  version TEXT,
+  documentation TEXT,
+  properties_schema TEXT,
+  operations TEXT,
+  credentials_required TEXT,
+  -- New columns for source code storage
+  node_source_code TEXT,
+  credential_source_code TEXT,
+  source_location TEXT,
+  source_extracted_at DATETIME,
+  -- Metadata
+  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Indexes for performance
+CREATE INDEX IF NOT EXISTS idx_package ON nodes(package_name);
+CREATE INDEX IF NOT EXISTS idx_ai_tool ON nodes(is_ai_tool);
+CREATE INDEX IF NOT EXISTS idx_category ON nodes(category);
+
+-- FTS5 table for full-text search including source code
+CREATE VIRTUAL TABLE IF NOT EXISTS nodes_fts USING fts5(
+  node_type,
+  display_name,
+  description,
+  documentation,
+  operations,
+  node_source_code,
+  content=nodes,
+  content_rowid=rowid
+);
+
+-- Trigger to keep FTS in sync
+CREATE TRIGGER IF NOT EXISTS nodes_fts_insert AFTER INSERT ON nodes
+BEGIN
+  INSERT INTO nodes_fts(rowid, node_type, display_name, description, documentation, operations, node_source_code)
+  VALUES (new.rowid, new.node_type, new.display_name, new.description, new.documentation, new.operations, new.node_source_code);
+END;
+
+CREATE TRIGGER IF NOT EXISTS nodes_fts_update AFTER UPDATE ON nodes
+BEGIN
+  UPDATE nodes_fts 
+  SET node_type = new.node_type,
+      display_name = new.display_name,
+      description = new.description,
+      documentation = new.documentation,
+      operations = new.operations,
+      node_source_code = new.node_source_code
+  WHERE rowid = new.rowid;
+END;
+
+CREATE TRIGGER IF NOT EXISTS nodes_fts_delete AFTER DELETE ON nodes
+BEGIN
+  DELETE FROM nodes_fts WHERE rowid = old.rowid;
+END;