fix: add axios to Docker builder dependencies for TypeScript compilation

- TypeScript needs axios to compile template-fetcher.ts
- Runtime doesn't need axios since templates are in pre-built database
- Maintains minimal runtime dependencies

🤖 Generated with Claude Code

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

Dockerfile

@@ -12,7 +12,7 @@ COPY tsconfig.json ./
 RUN --mount=type=cache,target=/root/.npm \
     echo '{}' > package.json && \
     npm install --no-save typescript@^5.8.3 @types/node@^22.15.30 @types/express@^5.0.3 \
-        @modelcontextprotocol/sdk@^1.12.1 dotenv@^16.5.0 express@^5.1.0
+        @modelcontextprotocol/sdk@^1.12.1 dotenv@^16.5.0 express@^5.1.0 axios@^1.10.0
 
 # Copy source and build (excluding n8n-specific files)
 COPY src ./src