Rename Wrystr to Vega

Named after Jurij Vega (1754-1802), Slovenian mathematician who made
knowledge accessible through his logarithm tables. Rebrand before
OpenSats application (April 1).

- Product name, window title, identifiers, binary name all renamed
- Cargo package: wrystr -> vega, wrystr_lib -> vega_lib
- PKGBUILD: wrystr -> vega (new AUR package name)
- Release workflow: artifact names, release text updated
- README: new tagline referencing Jurij Vega
- DB migration: auto-renames wrystr.db -> vega.db on first launch
- Keyring service name kept as "wrystr" for backward compatibility
- localStorage keys kept as wrystr_* to preserve existing user data

Pending manual steps:
- Rename GitHub repo hoornet/wrystr -> hoornet/vega
- Create new AUR package vega-git, orphan wrystr-git
- Update local .desktop launcher

src-tauri/Cargo.lock

@@ -5218,6 +5218,25 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
+name = "vega"
+version = "0.9.11"
+dependencies = [
+ "keyring",
+ "rusqlite",
+ "serde",
+ "serde_json",
+ "tauri",
+ "tauri-build",
+ "tauri-plugin-dialog",
+ "tauri-plugin-fs",
+ "tauri-plugin-http",
+ "tauri-plugin-notification",
+ "tauri-plugin-opener",
+ "tauri-plugin-process",
+ "tauri-plugin-updater",
+]
+
 [[package]]
 name = "version-compare"
 version = "0.2.1"
@@ -6155,25 +6174,6 @@ dependencies = [
  "x11-dl",
 ]
 
-[[package]]
-name = "wrystr"
-version = "0.9.11"
-dependencies = [
- "keyring",
- "rusqlite",
- "serde",
- "serde_json",
- "tauri",
- "tauri-build",
- "tauri-plugin-dialog",
- "tauri-plugin-fs",
- "tauri-plugin-http",
- "tauri-plugin-notification",
- "tauri-plugin-opener",
- "tauri-plugin-process",
- "tauri-plugin-updater",
-]
-
 [[package]]
 name = "x11"
 version = "2.21.0"