Add UAC elevation support with manifest

- Added guruconnect.manifest requesting highestAvailable privileges
- Using winres to embed manifest in executable
- Added is_elevated() function to detect admin status
- Logs elevation status on startup
- Manifest includes Windows 7-11 compatibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Cargo.lock

@@ -1029,7 +1029,7 @@ dependencies = [
  "thiserror 1.0.69",
  "tokio",
  "tokio-tungstenite",
- "toml",
+ "toml 0.8.2",
  "tracing",
  "tracing-subscriber",
  "tray-icon",
@@ -1037,6 +1037,7 @@ dependencies = [
  "uuid",
  "windows",
  "windows-service",
+ "winres",
  "zstd",
 ]
 
@@ -1061,7 +1062,7 @@ dependencies = [
  "sqlx",
  "thiserror 1.0.69",
  "tokio",
- "toml",
+ "toml 0.8.2",
  "tower",
  "tower-http",
  "tracing",
@@ -2968,7 +2969,7 @@ dependencies = [
  "cfg-expr",
  "heck 0.5.0",
  "pkg-config",
- "toml",
+ "toml 0.8.2",
  "version-compare",
 ]
 
@@ -3172,6 +3173,15 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "toml"
 version = "0.8.2"
@@ -3969,6 +3979,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winres"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b68db261ef59e9e52806f688020631e987592bd83619edccda9c47d42cde4f6c"
+dependencies = [
+ "toml 0.5.11",
+]
+
 [[package]]
 name = "wit-bindgen"
 version = "0.46.0"