[opencode/zhipuai] Add reasoning options

[rekram1-node]

Adds binary reasoning controls for six OpenCode Zen GLM models.

Evidence

• OpenCode Zen serves these GLM IDs through its OpenAI-compatible Chat Completions endpoint: https://opencode.ai/docs/zen/
• Z.AI defines thinking.type exactly as "enabled" or "disabled" for GLM-4.5 and newer: https://docs.z.ai/api-reference/llm/chat-completion
• GLM-4.6 uses hybrid or dynamic thinking when enabled; GLM-4.7, GLM-5, and GLM-5.1 use forced thinking: https://docs.z.ai/guides/capabilities/thinking-mode
• Adjustable reasoning_effort begins with GLM-5.2, so these entries intentionally advertise a toggle only: https://docs.z.ai/guides/overview/concept-param

There is no token-budget claim. clear_thinking controls history preservation, not reasoning amount. Scope is limited to opencode/zhipuai and supersedes that portion of #2247.