chore: prepare v3.0.0 release

- Bump version to 3.0.0 across all files
- Update Cargo.toml with proper package metadata
- Rename crate from 'app' to 'cc-switch'
- Use Rust edition 2024 with minimum rust-version 1.85.0
- Update library name to cc_switch_lib

src-tauri/Cargo.lock

@@ -90,23 +90,6 @@ version = "1.0.99"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b0674a1ddeecb70197781e945de4b3b8ffb61fa939a5597bcf48503737663100"
 
-[[package]]
-name = "app"
-version = "0.1.0"
-dependencies = [
- "dirs 5.0.1",
- "log",
- "objc2 0.5.2",
- "objc2-app-kit 0.2.2",
- "serde",
- "serde_json",
- "tauri",
- "tauri-build",
- "tauri-plugin-log",
- "tauri-plugin-opener",
- "tauri-plugin-shell",
-]
-
 [[package]]
 name = "arrayvec"
 version = "0.7.6"
@@ -565,6 +548,23 @@ dependencies = [
  "shlex",
 ]
 
+[[package]]
+name = "cc-switch"
+version = "3.0.0"
+dependencies = [
+ "dirs 5.0.1",
+ "log",
+ "objc2 0.5.2",
+ "objc2-app-kit 0.2.2",
+ "serde",
+ "serde_json",
+ "tauri",
+ "tauri-build",
+ "tauri-plugin-log",
+ "tauri-plugin-opener",
+ "tauri-plugin-shell",
+]
+
 [[package]]
 name = "cesu8"
 version = "1.1.0"