feat: add full creative studio + DevOps tools (Pixel, Lyra, Reel personas)

Adds 3 new personas (Pixel, Lyra, Reel) and 5 new tool modules:

- Git/DevOps tools (GitPython): clone, status, diff, log, blame, branch,
  add, commit, push, pull, stash — wired to Forge and Helm personas
- Image generation (FLUX via diffusers): text-to-image, storyboards,
  variations — Pixel persona
- Music generation (ACE-Step 1.5): full songs with vocals+instrumentals,
  instrumental tracks, vocal-only tracks — Lyra persona
- Video generation (Wan 2.1 via diffusers): text-to-video, image-to-video
  clips — Reel persona
- Creative Director pipeline: multi-step orchestration that chains
  storyboard → music → video → assembly into 3+ minute final videos
- Video assembler (MoviePy + FFmpeg): stitch clips, overlay audio,
  title cards, subtitles, final export

Also includes:
- Spark Intelligence tool-level + creative pipeline event capture
- Creative Studio dashboard page (/creative/ui) with 4 tabs
- Config settings for all new models and output directories
- pyproject.toml creative optional extra for GPU dependencies
- 107 new tests covering all modules (624 total, all passing)

https://claude.ai/code/session_01KJm6jQkNi3aA3yoQJn636c

src/dashboard/templates/base.html

@@ -26,6 +26,7 @@
       <a href="/spark/ui" class="mc-test-link">SPARK</a>
       <a href="/marketplace/ui" class="mc-test-link">MARKET</a>
       <a href="/tools" class="mc-test-link">TOOLS</a>
+      <a href="/creative/ui" class="mc-test-link">CREATIVE</a>
       <a href="/mobile" class="mc-test-link">MOBILE</a>
       <button id="enable-notifications" class="mc-test-link" style="background:none;border:none;cursor:pointer;" title="Enable notifications">🔔</button>
       <span class="mc-time" id="clock"></span>