Add PyInstaller spec and Gitea Actions CI for Linux/Windows binaries

- run.py: top-level entry point for PyInstaller (relative imports need it)
- psp-preserve.spec: onedir build bundling DATs, loader, cover bundles, icons
- requirements-build.txt: pinned build deps (PySide6 6.8.3 for Windows ICU fix)
- .gitea/workflows/build.yml: builds linux + windows artifacts on tags/manual
- gitignore build/ dist/

psp-preserve.spec

@@ -0,0 +1,65 @@
+# -*- mode: python ; coding: utf-8 -*-
+"""PyInstaller spec: build the PSP Preservation Tool (onedir).
+
+Bundles the read-only resources (DATs, PS1 loader, offline cover bundles,
+icons) under ``_internal/`` next to the executable. User-writable data
+(credentials, manual covers, PS1 templates, NPS cache, library DB, cover
+cache) lives in the OS state dir at runtime — see ``app/config.py``.
+
+Usage:  pyinstaller --clean --noconfirm psp-preserve.spec
+Output: dist/psp-preserve/
+"""
+from PyInstaller.utils.hooks import collect_dynamic_libs, collect_submodules
+
+datas = [
+    ("data/dats", "data/dats"),
+    ("data/loader", "data/loader"),
+    ("data/supplement.json", "data"),
+    ("data/covers/libretro-covers.zip", "data/covers"),
+    ("data/covers/openvgdb-covers.zip", "data/covers"),
+    ("data/covers/libretro-index.json", "data/covers"),
+    ("data/covers/openvgdb-index.json", "data/covers"),
+    ("data/covers/UMD_COVER_TEMPLATE.png", "data/covers"),
+    ("data/covers/UMD_COVER_TEMPLATE_FEATURE.png", "data/covers"),
+    ("data/covers/UMD_GAME_COVER_TEMPLATE.png", "data/covers"),
+    ("img/app-icon.png", "img"),
+    ("img/chevron.png", "img"),
+]
+
+a = Analysis(
+    ["run.py"],
+    pathex=[],
+    binaries=collect_dynamic_libs("curl_cffi"),
+    datas=datas,
+    hiddenimports=collect_submodules("curl_cffi"),
+    hookspath=[],
+    hooksconfig={},
+    runtime_hooks=[],
+    excludes=["tkinter", "unittest", "pydoc"],
+    noarchive=False,
+)
+
+pyz = PYZ(a.pure)
+
+exe = EXE(
+    pyz,
+    a.scripts,
+    [],
+    exclude_binaries=True,
+    name="psp-preserve",
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=False,
+    console=False,
+    disable_windowed_traceback=False,
+)
+
+coll = COLLECT(
+    exe,
+    a.binaries,
+    a.datas,
+    strip=False,
+    upx=False,
+    name="psp-preserve",
+)