Add extra prompts, endless generation, random character default, and small fixes

- Add extra positive/negative prompt textareas to all 9 detail pages with session persistence
- Add Endless generation button to all detail pages (continuous preview generation until stopped)
- Default character selector to "Random Character" on all secondary detail pages
- Fix queue clear endpoint (remove spurious auth check)
- Refactor app.py into routes/ and services/ modules
- Update CLAUDE.md with new architecture documentation
- Various data file updates and cleanup

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

templates/generator.html

@@ -18,9 +18,14 @@
 
                         <!-- Controls bar -->
                         <div class="d-flex align-items-center gap-2 flex-wrap mb-3 pb-3 border-bottom">
-                            <button type="submit" class="btn btn-primary" id="generate-btn">Generate</button>
+                            <button type="submit" class="btn btn-primary" id="generate-btn" data-requires="comfyui">Generate</button>
                             <input type="number" id="num-images" value="1" min="1" max="999"
                                    class="form-control form-control-sm" style="width:65px" title="Number of images">
+                            <div class="input-group input-group-sm" style="width:180px">
+                                <span class="input-group-text">Seed</span>
+                                <input type="number" class="form-control" id="seed-input" name="seed" placeholder="Random" min="1" step="1">
+                                <button type="button" class="btn btn-outline-secondary" id="seed-clear-btn" title="Clear (random)">&times;</button>
+                            </div>
                             <button type="button" class="btn btn-outline-warning" id="endless-btn">Endless</button>
                             <button type="button" class="btn btn-danger d-none" id="stop-btn">Stop</button>
                             <div class="ms-auto form-check mb-0">
@@ -364,6 +369,7 @@
                 if (placeholder) placeholder.classList.add('d-none');
                 resultFooter.classList.remove('d-none');
             }
+            updateSeedFromResult(jobResult.result);
             progressBar.classList.remove('progress-bar-striped', 'progress-bar-animated');
         }