refactor: extract seed provision scripts to dedicated directory

Move bootstrap, default, and inform scripts from inline template
strings in lib/init.ts to standalone files under seed/, loaded via
an esbuild text-loader plugin. Add type-checking (provisions.d.ts,
tsconfig.json) and ESLint config for the seed scripts. Set tsconfig
module to Preserve to support import attributes.

build/build.ts

@@ -92,6 +92,19 @@ const assetsPlugin = {
   },
 } as esbuild.Plugin;
 
+const seedPlugin = {
+  name: "seed",
+  setup(build) {
+    build.onLoad({ filter: /\/seed\// }, (args) => {
+      if (args.with?.["type"] !== "text") return undefined;
+      let contents = fs.readFileSync(args.path, "utf8");
+      // Strip TypeScript directives that are only needed for type-checking
+      contents = contents.replace(/^\s*\/\/\s*@ts-.*\n/gm, "");
+      return { contents, loader: "text" };
+    });
+  },
+} as esbuild.Plugin;
+
 const packageDotJsonPlugin = {
   name: "packageDotJson",
   setup(build) {
@@ -295,7 +308,7 @@ async function generateBackendJs(): Promise<void> {
     banner: { js: "#!/usr/bin/env node" },
     entryPoints: services.map((s) => `bin/${s}.ts`),
     outdir: path.join(OUTPUT_DIR, "bin"),
-    plugins: [packageDotJsonPlugin, assetsPlugin],
+    plugins: [packageDotJsonPlugin, assetsPlugin, seedPlugin],
   });
 
   for (const bin of services) {

build/lint.ts

@@ -5,7 +5,7 @@ const execPromise = promisify(exec);
 
 async function runEslint(): Promise<string> {
   const CMD =
-    "eslint 'bin/*.ts' 'lib/**/*.ts' 'ui/**/*.ts' 'test/**/*.ts' 'build/**/*.ts'";
+    "eslint 'bin/*.ts' 'lib/**/*.ts' 'ui/**/*.ts' 'test/**/*.ts' 'build/**/*.ts' 'seed/*'";
   const env = {
     ...(process.stdout.isTTY && { FORCE_COLOR: "1" }),
     ...process.env,
@@ -21,7 +21,7 @@ async function runEslint(): Promise<string> {
 }
 
 async function runTsc(): Promise<string> {
-  const CMD = "tsc --noEmit";
+  const CMD = "tsc --noEmit && tsc -p seed/tsconfig.json";
   const env = {
     ...(process.stdout.isTTY && { FORCE_COLOR: "1" }),
     ...process.env,