docs: update README for Python 3 port

* Update Python 2.7 references to Python 3
* Add dependency installation instructions
* Document how to run the server
* Add DSi proxy setup instructions for port 8080
* Document bundled Hatenatools utilities
* Note Python 3.13 compatibility changes
* Add information about the Python 3 port and project documentation

readme.md

@@ -1,12 +1,59 @@
-Hatena server - by pbsds
-======
-
-This is a replacement for the Flipnote Hatena service for the DSi which has ended.
-It's written in Python 2.7 and requires Twisted.
-Future versions could need PIL aswell.
-This project uses Hatenatools, which is also written by me. It can be found here: http://pbsds.net/projects/hatenatools
-
-To use it, simply run server.py.
-On the DSi, set the proxy settings to point to this server on port 8080, then access Flipnote Studio as usual. A more detailed guide is on the wiki section.
-
-Documentation on the formats Flipnote Studio uses can be found in the wiki section of this git.
+# Hatena server — Python 3 port
+
+This is a replacement server for the discontinued Flipnote Hatena service used by Flipnote Studio on Nintendo DSi.
+
+This repository has been ported from its original Python 2.7 implementation to **Python 3**. The server protocol, URL layout, plaintext database, bundled Hatena resources, PPM/TMB handling, UGO handling, and NTFT handling are retained.
+
+## Requirements
+
+- Python 3.9 or newer (the port is tested with Python 3.13)
+- Twisted
+- NumPy
+- Pillow
+- `ffmpeg` only if you want to use the optional PPM-to-MKV export command
+
+Install Python dependencies with:
+
+```bash
+python3 -m pip install -r requirements.txt
+```
+
+## Run the server
+
+From the repository root:
+
+```bash
+python3 server.py
+```
+
+The server listens on TCP port **8080** by default, matching the original project. Point the DSi proxy settings at the machine running this server, port 8080, then open Flipnote Studio.
+
+The server accepts the absolute-form HTTP request targets normally sent by a proxy client and restricts normal Hatena routes to requests carrying the DSi session header, as the original implementation did.
+
+## Hatenatools utilities
+
+The bundled format utilities are Python 3 compatible:
+
+```bash
+python3 Hatenatools/PPM.py
+python3 Hatenatools/UGO.py
+python3 Hatenatools/NTFT.py
+```
+
+PPM/TMB parsing, thumbnails, frame decoding, sound decoding, UGO packing/parsing, and NTFT packing/parsing use `bytes` explicitly under Python 3. The PPM sound decoder no longer depends on the removed `audioop` standard-library module, so it works on Python 3.13+.
+
+## Tests
+
+Run the included smoke/regression suite with:
+
+```bash
+python3 -m unittest discover -s tests -v
+```
+
+The tests use the original repository's bundled sample Flipnote and NTFT/UGO assets. The server resource-tree smoke test can run even when Twisted is not installed by using a minimal test-only stub; running the actual server still requires Twisted.
+
+## Notes
+
+The database remains the original single-process plaintext backend. Its files live under `database/`, and uploaded Flipnotes are written under `database/Creators/<creator-id>/`.
+
+The original project and Hatenatools licensing files are retained. See `license.md` and `Hatenatools/License.txt`.