fix tiktok media proxy urls

[rosethornbush]

Summary

• stop probing TikTok video URLs from the API worker during media parsing
• pass TikTok's aweme/v1/play URL through the API response
• resolve that aweme URL in the bot builder with a range request and Discordbot UA before sending media to Discord

Root cause

The hosted API worker can be blocked by TikTok when it tries to validate media URLs, leaving the transformed post with no media. The bot runtime is a better place to do the final media redirect check because it builds the Discord message immediately before sending it.

Validation

• pnpm exec moon ci platforms:lint platforms:fmt/check
• pnpm exec moon ci bot:lint bot:fmt/check
• repro URL selects aweme/v1/play for https://tiktok.com/@hijh7873/video/7636361168755395870
• bot-side resolver follows that URL with Discordbot/2.0 and gets 206 video/mp4

Fixes #86

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