Restore private message replies

[NeverBehave]

Summary

• extract text-message handling into a dedicated Worker handler
• route Telegram message updates through that handler
• add a regression test for private-chat replies with the same spaced format

Verification

• corepack yarn test
• WRANGLER_LOG_PATH=/tmp/kongebot-wrangler-private.log corepack yarn run build

[Copilot]

Copilot review overview

🟢 Approval recommended

The reviewed changes and regression coverage address the requested behavior with no unresolved blocking issues.

Review effort: Lite
Findings: None

What changed in this PR

Restores private-message replies by extracting text-message handling into a dedicated Worker handler and adding regression coverage.

Changes:

• Added handleTextMessage for validation and reply handling.
• Routed message updates through the new handler.
• Added private-chat spacing regression coverage.

File	Description
test/​index.test.js	Tests private-chat text-message replies.
index.js	Adds and wires the text-message handler.

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