### Add Math Preprocessing for Markdown Component
#### Summary
This PR introduces preprocessing for math expressions within the Markdown component. The component now transforms inline math (e.g., `\(...\)`) to use the `$ ... $` format and block math (e.g., `\[...\]`) to use the `$$ ... $$` format. This enhancement helps in standardizing the math syntax before it’s processed by the Markdown renderer.
#### Changes
- **Enhanced Markdown Component:**
- Added a `useMemo` hook in the `Markdown` function to preprocess the `children` content.
- **Inline Math:** Replaces `\(...\)` with `$ ... $`.
- **Block Math:** Replaces `\[...\]` with `\n$$\n ... \n$$\n`, ensuring that block math expressions are placed on separate lines.
- **Refactoring:**
- The processed content is then passed to the existing `MarkdownContent` component, preserving all existing functionalities like code highlighting, link rendering, and file block handling.
#### Rationale
Previously, the Markdown component did not handle the conversion of LaTeX-style math delimiters, which could lead to inconsistent rendering of math expressions. By preprocessing the content, we ensure a more robust and flexible handling of both inline and block math expressions.
#### Possible Drawbacks
- **Non-Mathematical Content Interference:**
The preprocessing approach targets `\(...\)` and `\[...\]` delimiters universally. This means that any non-mathematical content using these delimiters for other purposes might be unintentionally transformed, potentially leading to unexpected formatting issues.
#### How to Test
1. **Inline Math:**
- Input: `This is inline math: \(a^2 + b^2 = c^2\)`
- Expected Transformation: `This is inline math: $ a^2 + b^2 = c^2 $`
2. **Block Math:**
- Input: `Here is block math: \[ \int_0^\infty e^{-x} dx \]`
- Expected Transformation:
```
Here is block math:
$$
\int_0^\infty e^{-x} dx
$$
```
3. **Non-Mathematical Content:**
- Ensure that content not intended as math that might incidentally use these delimiters is reviewed to avoid unexpected changes.
4. **Overall Rendering:**
- Verify that the Markdown renders as expected with both math expressions and other markdown elements (e.g., code blocks, links).
#### Additional Notes
- The changes maintain backwards compatibility. If there are no math delimiters present, the content remains unaffected.
- The updated component still supports HTML rendering based on the `acceptHtml` prop.
- No changes were made to the auxiliary components (`Label`, `Link`, `Code`), ensuring that the overall markdown styling and functionalities remain consistent.
Add support for multiple SMTP providers in `utils/smtp.go`.
* **Provider-specific handling**:
- Add specific handling for Outlook, QQ, Office365, Resend, and Tencent SMTP policies.
- Use `switch` statement to set `TLSConfig` based on the SMTP host.
