docs: create roadmap (10 phases)

Phases:
1. Foundation: Database, migrations, repository, deployment
2. Plugin System: Discovery, lifecycle, dependencies, extension API
3. Component System: Reusable UI with HTMX
4. Theme Engine: Layouts, partials, Vue integration
5. CLI Scaffolding: Plugin/theme/component commands
6. Backend Authentication: Users, login, RBAC
7. Admin Forms & Lists: YAML-driven generation
8. Admin Dashboard: Widgets and settings
9. Content Management: Pages, media, menus
10. Core Plugins: User and Blog plugins

All 43 v1 requirements mapped to phases.

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-02-04)
+
+**Core value:** A CMF that enables rapid application development with the flexibility to support any use case, delivered with the performance and horizontal scaling that PHP cannot provide.
+**Current focus:** Phase 1 - Foundation
+
+## Current Position
+
+Phase: 1 of 10 (Foundation)
+Plan: 0 of 3 in current phase
+Status: Ready to plan
+Last activity: 2026-02-04 - Roadmap created
+
+Progress: [..........] 0%
+
+## Performance Metrics
+
+**Velocity:**
+- Total plans completed: 0
+- Average duration: -
+- Total execution time: 0 hours
+
+**By Phase:**
+
+| Phase | Plans | Total | Avg/Plan |
+|-------|-------|-------|----------|
+| - | - | - | - |
+
+**Recent Trend:**
+- Last 5 plans: -
+- Trend: -
+
+*Updated after each plan completion*
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- [Roadmap]: Comprehensive depth selected (10 phases, 29 plans)
+- [Roadmap]: Plugin System identified as architectural bottleneck - Phase 2
+- [Research]: Quill for database (compile-time SQL validation), ScalaTags + HTMX for frontend
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+- Research flag: Plugin System (Phase 2) needs deep research before planning
+- Research flag: Admin Backend (Phase 7-8) has hidden complexity (YAML edge cases)
+
+## Session Continuity
+
+Last session: 2026-02-04
+Stopped at: Roadmap created with 10 phases and 43 requirements mapped
+Resume file: None