Add opencode-chat-channel to ecosystem documentation

[coneycode]

add a plugin to ecosystem documentation

Issue for this PR

• add a plugin named opencode-chat-channel to ecosystem documentation; the plugin could connect instant messaging bots like feishu/lark;

Type of change

• Documentation

What does this PR do?

• just add a plugin named opencode-chat-channel to docs;

How did you verify your code works?

• no code added;

Screenshots / recordings

• none;

[github-actions]

Hey! Your PR title Add opencode-chat-channel to ecosystem documentation doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• PR description is missing required template sections. Please use the PR template.
• No "Type of change" checkbox is checked. Please select at least one.
• No issue referenced. Please add Closes #<number> linking to the relevant issue.

Please edit this PR description to address the above within 2 hours, or it will be automatically closed.

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