chore: complete ManaCore → Mana rename (docs, go modules, plists, images)

Final cleanup of references missed in previous rename commits:

- Dockerfiles: PUBLIC_MANA_CORE_AUTH_URL → PUBLIC_MANA_AUTH_URL
- Go modules: github.com/manacore/* → github.com/mana/* (7 go.mod files)
- launchd plists: com.manacore.* → com.mana.* (14 files renamed + content)
- Image assets: *_Manacore_AI_Credits* → *_Mana_AI_Credits* (11 files)
- .env.example files: ManaCore brand strings → Mana
- .prettierignore: stale apps/manacore/* paths → apps/mana/*
- Markdown docs (CLAUDE.md, /docs/*): mana-core-auth → mana-auth, etc.

Excluded from rename: .claude/, devlog/, manascore/ (historical content),
client testimonials, blueprints, npm package refs (@mana-core/*).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.macmini.yml

@@ -911,7 +911,7 @@ services:
       PUBLIC_MANA_LLM_URL_CLIENT: https://llm.mana.how
       # Analytics & Error Tracking
       PUBLIC_UMAMI_WEBSITE_ID: 32777167-e026-4618-933a-3429120b479b
-      PUBLIC_GLITCHTIP_DSN: ${GLITCHTIP_DSN_MANACORE_WEB:-}
+      PUBLIC_GLITCHTIP_DSN: ${GLITCHTIP_DSN_MANA_WEB:-}
     ports:
       - "5000:5000"
     healthcheck: