v2.0.0: Modularize project into single-responsibility packages

Replaced monolithic modules/ package with a clean architecture:

- core/       config.py, utils.py
- ai/         models.py (ResilientModel), setup.py (init_models)
- story/      planner.py, writer.py, editor.py, style_persona.py, bible_tracker.py
- marketing/  cover.py, blurb.py, fonts.py, assets.py
- export/     exporter.py
- web/        app.py (Flask factory), db.py, helpers.py, tasks.py, routes/{auth,project,run,persona,admin}.py
- cli/        engine.py (run_generation), wizard.py (BookWizard)

Flask routes split into 5 Blueprints; all templates updated with blueprint-
prefixed url_for() calls. Dockerfile and docker-compose updated to use
web.app entry point and new package paths.

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

templates/project.html

@@ -164,7 +164,7 @@
                         </td>
                         <td>${{ "%.4f"|format(r.cost) }}</td>
                         <td>
-                            <a href="{{ url_for('view_run', id=r.id) }}" class="btn btn-sm btn-outline-primary">
+                            <a href="{{ url_for('run.view_run', id=r.id) }}" class="btn btn-sm btn-outline-primary">
                                 {{ 'View Active' if active_run and r.id == active_run.id and active_run.status in ['running', 'queued'] else 'View' }}
                             </a>
                             {% if r.status in ['failed', 'cancelled', 'interrupted'] %}