[formeo]

Branched from #20 and targets main: merging this PR alone lands #20 too. If #20 is merged first, this diff shrinks to the copy changes.

Why (Search Console, last 3 months)

• Joiner: 341 merge/join queries ("audio merger", "mp3 joiner", "combine audio files", "merge two audio files"…) at average position 39.
• Speed Changer: "audio slow downer", "slow down m4a", "slow down wav", "slow down audio online" sit at positions 16–25 with 0 clicks.
• Text to Speech: "text to speech -ai", "text to speech free -ai", "text to speech online -ai" are in the top 5–7, with 29 clicks from 243 impressions. Google's -ai excludes pages that contain the word, and ours doesn't.
• 87 mix/overlay queries ("audio mixer online", "overlap two audio files") — a feature the site doesn't have.

Changes

Joiner (EN + ZH via build_zh.py)

• The intro names it an "online audio merger and MP3 joiner"; a section heading now says "Combine audio files of any format".
• New FAQs: "How do I combine two audio files?", plus an honest "Can I overlay two audio files so they play at the same time? — Not yet", so people looking for mixing aren't misled.

Speed Changer

• Title "Audio Speed Changer & Slow Downer Online" (57); description mentions MP3/M4A/WAV and the three uses.
• New sections: a how-to list; slowing down a song to learn it (0.5–0.75x, same key, trim a passage first); speech for language learning and transcription; speeding up lectures and voice messages (60 min → 40 at 1.5x); supported formats.
• FAQs rebuilt around these questions (JSON-LD regenerated).

Text to Speech guard

• seo-check.yml fails if the word "AI" appears on either Text to Speech page, with a comment explaining why.

Checks

• SEO scan: titles 57–60, descriptions 147–151, one H1, JSON-LD valid; seo_sync.py --check OK; the AI guard passes now and fails on a test copy with "AI" in the heading.
• Links/hreflang, 390px overflow, contrast on 20 pages, Chinese page flows, exports: OK.

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