feat(slack-advanced): add send_channel_message tool

[Joao208]

Contexto

O slack-advanced-mcp só tinha send_dm pra enviar mensagens diretas. Não tinha como postar em canais.

Mudanças

Nova tool: send_channel_message

• Aceita channel ID (e.g. C01EXAMPLE) ou nome (e.g. #general)
• Resolve nomes de canal via conversations.list com paginação
• Suporta reply em thread via thread_ts
• Converte links markdown text pra Slack mrkdwn <url|text> quando content_type: text/markdown

Novo método no SlackClient: resolveChannelId

• Se o identifier já é um ID (uppercase alphanumeric), retorna direto
• Senão, pagina conversations.list buscando pelo nome

Arquivos alterados

• types.ts: schema SendChannelMessageParamsSchema
• tools/messaging.ts: método sendChannelMessage + helper convertMarkdownLinksToMrkdwn
• slack-client.ts: método resolveChannelId
• server.ts: registro da tool
• package.json: bump 1.0.0 → 1.1.0

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 226d502e-ffc4-4701-a230-aaa57421b515

📥 Commits

Reviewing files that changed from the base of the PR and between 07ab848 and b75e302.

📒 Files selected for processing (5)

• packages/slack-advanced/package.json
• packages/slack-advanced/src/server.ts
• packages/slack-advanced/src/slack-client.ts
• packages/slack-advanced/src/tools/messaging.ts
• packages/slack-advanced/src/types.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch joao-barros-/-add-send-channel-message

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