Initial import of 1407 block sources under blocks/

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

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+# reui-blocks
+
+Block source files for the Shadsite catalog.
+
+## Layout
+
+```
+blocks/
+  {slug}.tsx          # flat block sources (1407 files)
+  test/               # auxiliary imports (e.g. BlogBlocksPage)
+```
+
+Consumed by the main app via `BLOCKS_ROOT=./storage/blocks`.
+
+## Clone with main repo
+
+```bash
+git submodule update --init --recursive
+```
+
+## Update blocks in main repo
+
+```bash
+cd storage
+git pull origin main
+cd ..
+npm run blocks:sync-registry
+```