update: 表改动 主页改动

server-node/sql/schema/README.md

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+# Final Schema SQL
+
+This folder contains the final PostgreSQL table definitions, one table per file.
+
+Notes:
+- These files keep only the final schema shape.
+- They do not preserve historical migration steps.
+- The current runtime migration logic in `server-node/src/db/migrations.ts` is unchanged.