Port bun-mariadb conventions: init globals, db handler, split schema sync

- init() loads config, schema and the SQLite client once into globals
- all CRUD queries go through lib/db-handler.ts (optional per-call config)
- split db-schema-manager.ts into lib/schema/* with FK-aware table ordering
- add bun:test tests for schema ordering, FK constraints and schema sync
- config/schema files can be .ts/.js/.json/.yaml/.yml; db_schema_file_name
  is now optional (defaults to schema.* in db_dir)
- add export/import commands (database snapshot + schema archives)
- package exports map, type re-exports, hardened publish.sh
- validate table name in delete

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/lib/schema/drop-removed-tables.ts

@@ -0,0 +1,43 @@
+import type { Database } from "bun:sqlite";
+import { readLiveSchema } from "../../functions/live-schema";
+import { sqlQuoteIdent as q } from "../../utils/sql-safe";
+import removeDBManagerTable from "./remove-db-manager-table";
+
+type Params = {
+    db: Database;
+    existing_tables: string[];
+    schema_tables: string[];
+};
+
+/**
+ * Drop tables that are no longer in the schema
+ */
+export default function dropRemovedTables({
+    db,
+    existing_tables,
+    schema_tables,
+}: Params) {
+    console.log(`Cleaning up tables ...`);
+
+    const tablesToDrop = existing_tables.filter(
+        (t) =>
+            !schema_tables.includes(t) &&
+            !schema_tables.find((scT) => t.startsWith(scT + "_")),
+    );
+
+    const currentSchema = readLiveSchema();
+
+    for (const table of currentSchema?.tables || []) {
+        if (!table?.tableName) continue;
+
+        if (!schema_tables.includes(table.tableName)) {
+            tablesToDrop.push(table.tableName);
+        }
+    }
+
+    for (const tableName of tablesToDrop) {
+        console.log(`Dropping table: ${tableName}`);
+        db.run(`DROP TABLE IF EXISTS ${q(tableName)}`);
+        removeDBManagerTable({ db, table_name: tableName });
+    }
+}