feat: Linux packaging, SDK v0.7.1, fix rawmode conflict

- go.mod: SDK pseudo-version -> v0.7.1 (remote tag), go.sum updated
- cmd/waiter/rawmode_linux.go: remove (conflicts with raw_unix.go)
- cmd/gui/package.json: add rpm/AppImage Linux targets
- package/package-linux.sh: cross-distro packaging script (deb/tar.gz/rpm)
- package/linux/: DEBIAN control files, postinst/prerm, RPM spec

cmd/gui/package.json

@@ -22,7 +22,9 @@
     "productName": "HomeAgent",
     "linux": {
       "target": [
-        "deb"
+        "deb",
+        "rpm",
+        "AppImage"
       ],
       "category": "Utility",
       "icon": "icon.svg"