refactor: make optimized Dockerfile the default - remove full variant

- Rename Dockerfile.optimized to Dockerfile (now the default)
- Keep old Dockerfile as Dockerfile.old for reference
- Update GitHub Actions to use default Dockerfile
- Remove build-full job - only one image variant now
- Remove docker-compose.optimized.yml and other variants
- Update all documentation to reflect single image approach

The optimized 283MB image is now the only n8n-MCP Docker image.
This simplifies the user experience and provides the best solution
for all use cases.

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

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

docs/RELEASE_GUIDE.md

@@ -15,18 +15,11 @@ git push origin v1.2.3
 ```
 
 This will automatically create the following Docker tags:
-
-**Optimized Images:**
 - `ghcr.io/czlonkowski/n8n-mcp:1.2.3` (exact version)
 - `ghcr.io/czlonkowski/n8n-mcp:1.2` (minor version)
 - `ghcr.io/czlonkowski/n8n-mcp:1` (major version)
 - `ghcr.io/czlonkowski/n8n-mcp:latest` (if from main branch)
 
-**Full Images:**
-- `ghcr.io/czlonkowski/n8n-mcp:1.2.3-full` (exact version)
-- `ghcr.io/czlonkowski/n8n-mcp:1.2-full` (minor version)
-- `ghcr.io/czlonkowski/n8n-mcp:full` (if from main branch)
-
 ## Tag Types Explained
 
 ### Latest Tag
@@ -133,7 +126,7 @@ services:
   n8n-mcp:
     image: ghcr.io/czlonkowski/n8n-mcp:1.2
 
-# Latest version (for development/testing)
+# Latest version (for testing)
 services:
   n8n-mcp:
     image: ghcr.io/czlonkowski/n8n-mcp:latest