chore: add config for claude code on web (supabase#42044)

To use Claude Code on web, we need the LLM to have access to
dependencies. This creates a install_pkgs.sh script that runs `pnpm
install` only in the Claude Code remove environment.

Author: charislam

.claude/scripts/install_pkgs.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [ "$CLAUDE_CODE_REMOTE" != "true" ]; then
+  exit 0
+fi
+
+pnpm install

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/scripts/install_pkgs.sh"
+          }
+        ]
+      }
+    ]
+  }
+}

.gitignore

@@ -117,7 +117,9 @@ next-env.d.ts
 .vercel
 
 # AI assistant local files
-.claude/
+.claude/*
+!.claude/settings.json
+!.claude/scripts/
 CLAUDE.md
 
 #include template .env file for docker-compose
@@ -149,4 +151,4 @@ gcloud.json
 # Sentry CLI config
 **/.sentryclirc
 
-keys.json
+keys.json