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>

ocp-plugin/openclaw.plugin.json

@@ -2,7 +2,7 @@
   "id": "ocp",
   "name": "OCP Commands",
   "description": "Slash commands for the OpenClaw Proxy — /ocp usage, /ocp settings, /ocp health, etc.",
-  "version": "3.2.2",
+  "version": "3.3.0",
   "configSchema": {
     "type": "object",
     "additionalProperties": false,

ocp-plugin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ocp",
-  "version": "3.2.2",
+  "version": "3.3.0",
   "description": "Slash commands for the OpenClaw Proxy",
   "main": "index.js",
   "type": "module",