Add npm scripts and justfile for development workflow

Scripts cover linting, type checking, testing, and dev server.
Justfile provides docker commands and unified check command.

justfile

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+default:
+    @just --list
+
+dev:
+    bun run dev
+
+start:
+    bun run start
+
+check:
+    bun run lint && bun run typecheck && bun run test
+
+build:
+    docker build -t claude-remote .
+
+up:
+    docker compose up -d
+
+down:
+    docker compose down
+
+logs:
+    docker compose logs -f

package.json

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+{
+  "name": "claude-remote",
+  "description": "Self-hosted remote control for Claude Code - wrap CLI in PTY, stream output, approve prompts from phone",
+  "module": "index.ts",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "lint": "bunx biome check --write .",
+    "dev": "bun run --watch src/server.ts",
+    "start": "bun run src/server.ts",
+    "test": "bun test",
+    "typecheck": "bunx tsc"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "^2.3.13",
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "bun-pty": "^0.4.8"
+  }
+}