docs: add project-overview.html — full project documentation
Covers: overview, architecture, modules, data flows (4 flows), RAGAS metrics (7), API reference, weight config, deployment, tech stack, directory structure. Self-contained HTML with Siemens teal theme, sidebar scrollspy, responsive layout. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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