feat: add chatbot webhook flow and tests

[suissa]

Summary

• add a Fastify webhook server that hands WhatsApp messages to the chatbot orchestrator
• implement chatbot agents, memory, classification, and OpenAI LLM services with a mocked external appointment API
• configure Jest with new unit tests and a CI workflow to run them

Testing

• CI=true npm test
• npm run check-types

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Codex Task

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/suissa/sdk-evolution-chatbot/blob/c2526043cbf665f187139c2523cfdbae888c7eaf/src/chatbot/orchestrator.ts#L52-L54
Send appointment to API only after payment collected

In ChatbotOrchestrator.handleIncomingMessage the integration call is gated on nextAgentName === "appointmentPayment" (lines 52‑54), which refers to the following agent. This means the external API is triggered as soon as the current agent is appointmentProfessional—before a payment response exists—and it is never triggered once the user actually replies to the appointmentPayment prompt (because nextAgentName is then undefined and the method returns). Consequently the external service never sees the completed snapshot and receives incomplete appointment data. The condition needs to check the current agent (agent.name) so the payload is sent after payment information has been collected.

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