feat: bootstrap foundation application

content/architecture-overview.md

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+# Architecture Overview
+
+MD Hub Secure uses a Go application server as the primary runtime.
+
+- Markdown documents are read from the source directory.
+- The current version is written into content-addressed storage.
+- Metadata lives in the local libsql-compatible database.
+- HTML is rendered server-side first.
+
+See [[Getting Started]] for a feature-oriented overview.
+