TTS fixes, Inworld improvements, footer redesign, episodes 15-25, invoice script fix

- Fix TTS text pipeline: new caps handling (spell out unknown acronyms, lowercase
  emphasis words), action-word lookahead for parenthetical stripping, abbreviation
  expansions (US→United States, NM→New Mexico), pronunciation fixes
- Inworld TTS: camelCase API fields, speakingRate per-voice overrides, retry logic
  with exponential backoff (3 attempts)
- Footer redesign: SVG icons for social/podcast links across all pages
- Stats page: show "Rate us on Spotify" instead of "not public" placeholder
- New voices, expanded caller prompts and problem scenarios
- Social posting via Postiz, YouTube upload in publish pipeline
- Episode transcripts 15-25, terms page, sitemap updates
- Fix invoice script: match Timing totals using merged Task+App intervals

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -67,11 +67,13 @@ Required in `.env`:
   GIT_SSH_COMMAND="ssh -o HostName=mmgnas-10g -p 2222 -i ~/.ssh/gitea_mmgnas" git push origin main
   ```
 
-## Hetzner VPS (Mail Server)
+## Hetzner VPS
 - **IP**: `46.225.164.41`
 - **SSH**: `ssh root@46.225.164.41` (uses default key `~/.ssh/id_rsa`)
+- **Specs**: 2 CPU, 4GB RAM, 38GB disk (~33GB free)
 - **Mail**: `docker-mailserver` at `/opt/mailserver/`
 - **Manage accounts**: `docker exec mailserver setup email add/del/list`
+- **Available for future services** — has headroom for lightweight containers. Not suitable for storage-heavy services (e.g. Castopod with daily episodes) without a disk upgrade or attached volume.
 
 ## Episodes Published
 - Episode 6 published 2026-02-08 (podcast6.mp3, ~31 min)