Feat: add start.sh

## Test Plan

- Dev:
```bash
./start.sh -d
```

- Release:
```bash
./start.sh -r
```

- Usage:
```base
./start.sh -h
```

frontend/package.json

@@ -7,6 +7,7 @@
     "android": "expo run:android",
     "ios": "expo run:ios",
     "web": "expo start --web",
+    "web:build": "expo export --platform web",
     "lint": "expo lint",
     "test": "jest",
     "format:write": "prettier . --write",

start.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+trap "trap - SIGTERM && kill 0" SIGINT SIGTERM EXIT
+
+expo_build() {
+    cd frontend
+    pnpm web:build
+    cd ..
+}
+
+expo_start() {
+    cd frontend
+    pnpm start
+    cd ..
+}
+
+cargo_run_debug_proxy() {
+    cargo run -- --reverse-proxy
+}
+
+cargo_run_release() {
+    cargo run --release
+}
+
+usage() {
+    echo "Usage: $0 [OPTIONS]"
+    echo "Options:"
+    echo " -h, --help      Display this help message."
+    echo " -d, --dev       Run in development mode."
+    echo " -r, --release   Run in release mode."
+}
+
+handle_options() {
+    while [ $# -gt 0 ]; do
+        case $1 in
+            -h | --help)
+                usage
+                exit 0
+                ;;
+            -d | --dev)
+                cargo_run_debug_proxy &
+                expo_start 
+                ;;
+            -r | --release)
+                expo_build
+                cargo_run_release
+                ;;
+            *)
+                echo "Invalid option: $1" >&2
+                usage
+                exit 1
+                ;;
+        esac
+        shift 1
+    done
+}
+if [ "$#" -eq 0 ];
+then
+    usage
+else
+    handle_options "$@"
+fi