Build edit-docs as standalone package using makeApp

Changed edit-docs from a simple wrapper script to a properly built Nix
package using makeApp, similar to how desktop and server are built.

Changes:
- Added build script to apps/edit-docs/package.json
- Created apps/edit-docs/scripts/build.ts based on desktop's build script
- Added edit-docs:build task to root package.json
- Changed flake.nix to use makeApp which:
  - Builds edit-docs with all dependencies bundled
  - Creates a standalone trilium-edit-docs executable
  - Can be installed with 'nix profile install' and run from any directory

This makes edit-docs truly reusable - it can now be installed and run
from any project without requiring the Trilium source tree.

apps/edit-docs/scripts/build.ts

@@ -0,0 +1,40 @@
+import { writeFileSync } from "fs";
+import { join } from "path";
+
+import BuildHelper from "../../../scripts/build-utils";
+import originalPackageJson from "../package.json" with { type: "json" };
+
+const build = new BuildHelper("apps/edit-docs");
+
+async function main() {
+    await build.buildBackend(["src/edit-docs.ts", "src/utils.ts"]);
+
+    // Copy assets from server (needed for DB initialization)
+    build.copy("/apps/server/src/assets", "assets/");
+    build.triggerBuildAndCopyTo("packages/share-theme", "share-theme/assets/");
+    build.copy("/packages/share-theme/src/templates", "share-theme/templates/");
+    build.copy("/node_modules/ckeditor5/dist/ckeditor5-content.css", "ckeditor5-content.css");
+    build.buildFrontend();
+
+    // Copy node modules dependencies
+    build.copyNodeModules(["better-sqlite3", "bindings", "file-uri-to-path", "@electron/remote"]);
+
+    generatePackageJson();
+}
+
+function generatePackageJson() {
+    const { version, author, license, description, dependencies, devDependencies } = originalPackageJson;
+    const packageJson = {
+        name: "trilium-edit-docs",
+        main: "edit-docs.cjs",
+        version,
+        author,
+        license,
+        description,
+        dependencies: {"better-sqlite3": dependencies["better-sqlite3"]},
+        devDependencies: {electron: devDependencies.electron},
+    };
+    writeFileSync(join(build.outDir, "package.json"), JSON.stringify(packageJson, null, "\t"), "utf-8");
+}
+
+main();