docs(mcp-proxy): real upstream invocations, promote to top-level README section

[vaaraio]

Summary

Two problems shipped in #100 and #101, both fixed here:

1. README's MCP proxy code example referenced a fictional npm package (@sap/adt-mcp-server). It also buried the MCP proxy block as a third-tier subsection under Framework integrations, despite v0.21.0 being the headline ship and having two worked demos.
2. SAP demo's example config used a broken npx invocation (npx -y @mario-andreschak/mcp-abap-abap-adt-api — that package isn't published on npm under that scope). Real install path is clone + build + run with node /path/to/dist/index.js.

Changes

README.md

• Removed the buried ### MCP proxy block from under Framework integrations.
• Added a new top-level ## MCP proxy section between TypeScript client and OVERT.
• One-line worked example uses @sap/mdk-mcp-server, SAP's official Mobile Development Kit MCP server (published on npm, version 0.3.7, Apache-2.0, verified).
• Cross-links to both demo folders.

examples/sap-mcp-proxy-demo/claude_code_config.example.json

• Primary block (sap-mdk-via-vaara) now uses the real @sap/mdk-mcp-server npx invocation with --schema-version 26.3.
• Sibling _alternative_abap_adt block uses the real node /PATH_TO_YOUR/mcp-abap-abap-adt-api/dist/index.js invocation per Mario's README.
• Sibling _alternative_btp_odata block clarified as the same clone+build shape for lemaiwo's server.

examples/sap-mcp-proxy-demo/README.md

• Prereqs section now names each upstream's actual install path (npm-published for MDK, clone+build for the others).
• Before/After config blocks now show the real MDK invocation.
• Body text now steers ABAP/OData readers to the alternative blocks in the example config.

Verification

All upstream package/repo references verified live this session:

• @sap/mdk-mcp-server on npm: version 0.3.7, bin mdk-mcp, description "Model Context Protocol (MCP) server for AI-assisted development of MDK applications" — runnable via npx -y @sap/mdk-mcp-server.
• SAP/mdk-mcp-server repo: 31 stars, Apache-2.0.
• mario-andreschak/mcp-abap-abap-adt-api repo: 134 stars, MIT, install path confirmed from its README is node /path/to/dist/index.js after clone + npm install + npm run build.
• @mario-andreschak/mcp-abap-abap-adt-api on npm: not found (was the broken reference).

Docs-only. No code changes, no test changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between 724a676 and 9a3c401.

📒 Files selected for processing (3)

• README.md
• examples/sap-mcp-proxy-demo/README.md
• examples/sap-mcp-proxy-demo/claude_code_config.example.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/mcp-proxy-fix-real-invocations

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