Description

Add an Architecture section to docs/development.md and fix documentation inaccuracies, addressing the remaining items in #1159.

• Architecture section — System overview with Mermaid diagram showing client → proxy → database flow (with optional direct path), monorepo structure, key libraries with rationale, and the connector/explorer pattern
• Build for Production fix — Removed incorrect claim about two dist folders; the proxy server has no build step since migrating to native type stripping
• Dangling reference fix — Replaced broken "See below" text in deploy-with-docker.md with a link to the connections feature page

Validation

• All content verified against actual package.json scripts, source imports, and project structure
• pnpm checks passes (lint, format, types)
• Mermaid diagram renders correctly on GitHub

Related Issues

• Fixes Update content to be more clear and focused #1159

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I have verified pnpm checks passes with no errors.
• I have verified pnpm test passes with no failures.
• I have covered new added functionality with unit tests if necessary.
• I have updated documentation if necessary.