fix(telegram): validate bot chat ids

[aiirvizionz]

Summary

• require Telegram bot destinations to be decimal integer chat IDs
• preserve negative group IDs while rejecting zero, fractions, alternate numeric syntax, whitespace, and unsafe integers
• prevent Number coercion and rounding from sending to the wrong chat

Verification

• corepack pnpm@9.12.0 exec vitest run packages/bots/telegram/src/index.test.ts (15 passed)
• corepack pnpm@9.12.0 --filter @profullstack/sh1pt-bot-telegram typecheck
• git diff --check

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