refactor: simplify timeout to single CLAUDE_TIMEOUT (default 600s)

Remove firstByteTimeout, adaptive tier algorithm, and MODEL_TIMEOUT_TIERS.
Claude tool-use causes 30s-5min pauses in token streams, making fine-grained
timeouts unreliable — they repeatedly killed valid requests. A single generous
timeout (10 min, matching LiteLLM/OpenAI SDK defaults) is simpler and correct.

Breaking: CLAUDE_FIRST_BYTE_TIMEOUT env var removed, default timeout changed
from 300s to 600s. Bump to v3.3.0.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "openclaw-claude-proxy",
-  "version": "3.2.2",
+  "version": "3.3.0",
   "description": "OCP (Open Claude Proxy) — use your Claude Pro/Max subscription as an OpenAI-compatible API for any IDE. Works with Cline, OpenCode, Aider, Continue.dev, OpenClaw, and more.",
   "type": "module",
   "bin": {