fix: claude subprocess auth failure (exit code 1) when using HTTP proxy

[cccccccAi]

Problem

When CodePilot is launched from Dock/Finder (not from a terminal), HTTPS_PROXY/HTTP_PROXY are absent from the Electron process environment. As a result, the claude subprocess cannot reach the Anthropic API and exits with code 1.

Symptoms:

• is_error: true, input_tokens: 0, output_tokens: 0
• Error message: "Claude Code process exited with an error... Invalid or missing API Key"
• Works fine when CodePilot is launched from a terminal that has proxy env vars set

Affected users: Anyone using a system-level HTTP proxy to access the internet (common in mainland China and enterprise environments).

Root Cause

The proxy is typically defined in ~/.zshrc / ~/.bashrc. While loadUserShellEnv() in electron/main.ts runs zsh -ilc env to load shell variables, this can fail silently in certain GUI app launch contexts, leaving HTTPS_PROXY out of the subprocess environment.

Additionally, users who authenticate via claude auth login (subscription / OAuth) store their token in the macOS Keychain — not in a file or env var — so CodePilot's SDK subprocess has no credentials to fall back on.

Fix

src/lib/platform.ts — Add getClaudeOAuthTokenFromKeychain():

Reads the OAuth accessToken from the macOS Keychain entry "Claude Code-credentials" (where claude auth login stores credentials). Returns null on non-macOS or if not found.

src/lib/claude-client.ts — Use Keychain token as fallback:

When no active provider and no ANTHROPIC_API_KEY/ANTHROPIC_AUTH_TOKEN is present in the environment, automatically read the OAuth token from Keychain and inject it as ANTHROPIC_AUTH_TOKEN before spawning the claude subprocess.

How to Reproduce

1. Install Claude Code CLI and authenticate via claude auth login (subscription user)
2. Set proxy in shell config: export HTTPS_PROXY=http://your-proxy:port in ~/.zshrc
3. Launch CodePilot from Dock (not from terminal)
4. Send any message → error: exit code 1

Testing

Verified locally:

• CodePilot launched without proxy env → previously failed with exit code 1
• CodePilot launched with proxy env (workaround) → works ✅
• After this fix, Keychain token is injected correctly and the subprocess authenticates ✅

Claude 连接状态: { "connected": true, "version": "2.1.71 (Claude Code)" }
Claude 响应: 我是 Claude Code，Anthropic 开发的 AI 编程助手...
is_error: false ✅