fix: surface weixin media send failures

[he-yufeng]

Fixes #8160.

Summary

• return a real error path when weixin_personal media segment sending fails
• include traceback details for prepare-media failures, including timeout errors whose string is empty
• add a focused unit test so failed media sends no longer look successful

Test plan

• .venv/Scripts/python.exe -m pytest tests/unit/test_weixin_oc_adapter.py -q -p no:cacheprovider --basetemp .tmp/pytest
• .venv/Scripts/python.exe -m ruff check astrbot/core/platform/sources/weixin_oc/weixin_oc_adapter.py tests/unit/test_weixin_oc_adapter.py
• .venv/Scripts/python.exe -m ruff format --check astrbot/core/platform/sources/weixin_oc/weixin_oc_adapter.py tests/unit/test_weixin_oc_adapter.py
• .venv/Scripts/python.exe -m py_compile astrbot/core/platform/sources/weixin_oc/weixin_oc_adapter.py tests/unit/test_weixin_oc_adapter.py
• git diff --check
• Select-String secret scan on changed files

Summary by Sourcery

Handle Weixin personal outbound message failures more robustly and ensure they are surfaced to callers.

Bug Fixes:

• Log full tracebacks for media preparation failures in the Weixin OC adapter.
• Propagate failures from media and text segment sends by raising when any segment fails instead of silently succeeding.

Tests:

• Add a unit test verifying that send_by_session raises when a media segment send fails.

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• Consider including the session/user identifier in the RuntimeError message (e.g., self.meta().id or target_user) so failures are easier to trace back in logs and error reporting.
• Instead of raising a generic RuntimeError, you might want to introduce or reuse a more specific exception type for outbound send failures so callers can distinguish this from other runtime issues.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider including the session/user identifier in the `RuntimeError` message (e.g., `self.meta().id` or `target_user`) so failures are easier to trace back in logs and error reporting.
- Instead of raising a generic `RuntimeError`, you might want to introduce or reuse a more specific exception type for outbound send failures so callers can distinguish this from other runtime issues.

## Individual Comments

### Comment 1
<location path="astrbot/core/platform/sources/weixin_oc/weixin_oc_adapter.py" line_range="1651-1654" />
<code_context>
                 "weixin_oc(%s): outbound message ignored, no supported segments",
                 self.meta().id,
             )
+        if failed_segments:
+            raise RuntimeError(
+                f"weixin_oc failed to send {failed_segments} message segment(s)"
+            )
</code_context>
<issue_to_address>
**suggestion:** Include contextual identifiers in the exception message for easier traceability.

Right now the `RuntimeError` only reports the number of failed segments. Please include key identifiers (e.g. `self.meta().id`, `session.session_id` or `target_user`) so operators can correlate this failure with logs and external systems, e.g.: `f"weixin_oc({self.meta().id}, session={session.session_id}) failed to send {failed_segments} segment(s)"`.

```suggestion
        if failed_segments:
            raise RuntimeError(
                f"weixin_oc({self.meta().id}, target_user={target_user}) "
                f"failed to send {failed_segments} message segment(s)"
            )
```
</issue_to_address>

---

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[gemini-code-assist]

Code Review

This pull request improves error handling in the WeixinOC adapter by tracking failed message segments and raising a RuntimeError if any segment fails to send. It also updates the logging to include exception information for better debugging and adds a unit test to verify that the adapter correctly raises an error when media segments fail to send.

[he-yufeng]

Addressed the review feedback in 34beb5f: the RuntimeError now includes the WeixinOC adapter id and target_user, and the regression assertion checks that context. Validation passed: focused WeixinOC adapter test, py_compile on the touched files, and ruff check on the touched files.