feat(provider): add OpenCode Go protocol providers

[piexian]

新增 OpenCode Go 订阅服务接入。OpenCode Go 要求客户端携带自身标识和稳定的对话会话请求头；仅通过通用服务商配置 API 地址和密钥，无法完整满足这些要求，可能导致 Go 订阅无法正常使用。此次添加专用入口，自动补齐所需请求头，并提供 Chat Completions、Responses 和 Messages 三种协议供用户选择
fixes #10054 #10045 #8158

Modifications / 改动点

• 新增三个 OpenCode Go 服务商模板，复用现有协议适配器。

• 使用 AstrBot/{版本} 标识客户端，通过具体对话 UUID 的稳定哈希生成 x-opencode-session 请求头。

• 主请求、工具重查询、上下文压缩、图片描述和标题生成传递所属对话 ID，确保同一对话使用一致标识。

• 添加中英文接入文档及测试。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Integrate OpenCode Go subscriptions with dedicated protocol providers and stable conversation-aware request identification.

New Features:

• Add dedicated OpenCode Go provider templates for Chat Completions, Responses, and Messages protocols.
• Automatically identify AstrBot clients and maintain stable per-conversation OpenCode session headers across requests and agent workflows.

Bug Fixes:

• Ensure tool retries, context compression, image captioning, and title generation retain the originating conversation identity.

Enhancements:

• Extend provider adapters to support request-specific headers while preserving existing protocol integrations.

Documentation:

• Add English and Chinese documentation for configuring OpenCode Go providers.

Tests:

• Add coverage for OpenCode Go protocol requests, headers, model selection, streaming, concurrent sessions, and conversation identity propagation.

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="astrbot/core/provider/sources/opencode_go_source.py" line_range="89-97" />
<code_context>
+        """
+        model = (model or self.get_model()).removeprefix("opencode-go/")
+        delegate = self.delegate
+        extra_headers = {
+            key: value
+            for key, value in (kwargs.pop("extra_headers", None) or {}).items()
+            if key.lower() not in {"user-agent", "x-opencode-session"}
+        }
+        # Calls without a conversation (such as connection tests) are independent.
+        extra_headers["x-opencode-session"] = hashlib.sha256(
+            (kwargs.pop("conversation_id", None) or uuid4().hex).encode()
+        ).hexdigest()
+        return await delegate.text_chat(
+            prompt=prompt,
</code_context>
<issue_to_address>
**issue (bug_risk):** The required `x-opencode-session` value is not sent as an HTTP header for the Chat Completions and Responses adapters. `extra_headers` is inserted into the payload, then those adapters classify the unknown `extra_headers` key as `extra_body`, so OpenCode Go receives it in the JSON request body instead of the request headers and rejects or misidentifies the request.

**Triggers:** When an OpenCode Go Chat Completions or Responses provider sends a request.

**Suggested fix:** Pass `extra_headers` to the SDK request as a top-level request option, rather than placing it in the payload consumed by `_query`.
</issue_to_address>

Sourcery assessment

Needs a human reviewer. 1 finding to address first, and this adds a third-party provider path that sends prompts, images, tool data, and API-authenticated requests to OpenCode Go while creating provider-side sessions keyed by conversation IDs. If the endpoint, protocol, or session handling is wrong, content could be sent to the wrong external service or mixed into a retained session; reverting stops future calls but cannot retract data already transmitted.

Blocking findings: astrbot/core/provider/sources/opencode_go_source.py:97

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[RC-CHN]

注意到事实上群聊上下文标注图片任务使用一个非稳定的session，考虑到此为一个独立任务语义上也尚可接受，请确定这是否为预期设计

[piexian]

顺带一提虽然他只是建议但是没有x-opencode-session已经百分百报错了所以才会有其他改动 @Soulter