chore(project): initialize project with core configuration and dependencies

- Add .gitignore and .env.example files for project setup
- Create build script for proto compilation with tonic-prost
- Generate Cargo.lock with all project dependencies
- Configure project structure and ignore patterns for development environment

build.rs

@@ -0,0 +1,15 @@
+use std::{env, path::PathBuf};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("cargo:rerun-if-changed=proto/email.proto");
+    println!("cargo:rerun-if-changed=proto");
+
+    let out_dir = PathBuf::from(env::var("OUT_DIR")?).join("pb");
+    std::fs::create_dir_all(&out_dir)?;
+
+    tonic_prost_build::configure()
+        .out_dir(&out_dir)
+        .compile_protos(&["proto/email.proto"], &["proto"])?;
+
+    Ok(())
+}