build(Build): optimize release build configuration and resolve dependency version conflict

- Added `.cargo/config.toml` to centralize Rust build settings for Mountain backend:
  - Sets `target-dir` to "Target" for unified build artifact location
  - Configures release profile with LTO, panic=abort, and symbol stripping to minimize binary size and improve runtime performance - critical for Land's Electron migration performance goals
- Resolved merge conflict in `package.json` by standardizing on @cloudflare/workers-types@4.20250528.0
  - Ensures consistent dependency versioning for Rest bundler and Cocoon extension host shim environment

These changes strengthen Land's build reproducibility while aligning with core objectives of reduced disk footprint and reliable cross-component dependency management.

Author: NikolaRHristov

.cargo/config.toml

@@ -0,0 +1,13 @@
+[build]
+target-dir = "Target"
+
+[cargo-new]
+vcs = "git"
+
+[profile.release]
+opt-level = 3
+codegen-units = 1
+debug = false
+lto = true
+panic = "abort"
+strip = true

package.json

@@ -29,11 +29,7 @@
 	},
 	"devDependencies": {
 		"@playform/build": "0.2.4",
-<<<<<<< HEAD
-		"@cloudflare/workers-types": "4.20250525.0",
-=======
 		"@cloudflare/workers-types": "4.20250528.0",
->>>>>>> 2279deab7e1dc7a4bad279ccc4f9f918b07dce10
 		"@types/dotenv": "8.2.3",
 		"miniflare": "4.20250523.0",
 		"wrangler": "4.17.0"