Normalize game_data line endings and document WSL development.

.gitattributes

@@ -1 +1,2 @@
 scripts/*.sh text eol=lf
+game_data/** text eol=lf

README.md

@@ -28,12 +28,31 @@ A web viewer for backups of the Android game **[Idle Fantasy](https://github.com
 
 ## Installation
 
+### Windows (PowerShell)
+
 ```powershell
 python -m venv .venv
 .\.venv\Scripts\Activate.ps1
 pip install -r requirements.txt
 ```
 
+### WSL (recommended for deploy)
+
+Keep the repo on the Linux filesystem (not `/mnt/c/`) to avoid CRLF/git/deploy issues between Windows and WSL:
+
+```bash
+# one-time clone or copy to e.g. ~/source/idle-fantasy-viewer
+cd ~/source/idle-fantasy-viewer
+python3 -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+```
+
+Open in **Cursor**: *File → Open Folder in WSL…* → `~/source/idle-fantasy-viewer`  
+Windows path (Explorer): `\\wsl.localhost\Ubuntu-24.04\home\markus\source\idle-fantasy-viewer`
+
+Run tests, dev server, and `bash scripts/deploy.sh` from the same WSL shell.
+
 ## Usage
 
 ### Start server and import a backup

scripts/sync_game_data.py

@@ -58,7 +58,7 @@ def main() -> None:
         synced.append(name)
         print(f"  {name}")
 
-    MANIFEST.write_text(
+    manifest_body = (
         json.dumps(
             {
                 "source_repo": f"https://github.com/{REPO}",
@@ -69,9 +69,10 @@ def main() -> None:
             },
             indent=2,
         )
-        + "\n",
-        encoding="utf-8",
+        + "\n"
     )
+    with MANIFEST.open("w", encoding="utf-8", newline="\n") as manifest_file:
+        manifest_file.write(manifest_body)
     print(f"Synced {len(synced)} files -> {OUT_DIR}")
     print(f"Manifest: {MANIFEST} (sha {sha[:12]})")