docs: create roadmap (6 phases)

Phases:
1. Foundation: data model, repository, project structure
2. Core CRUD: entries, quick capture, responsive UI (12 reqs)
3. Images: attachments, camera capture (4 reqs)
4. Tags & Organization: tagging, pin, due dates (7 reqs)
5. Search: full-text, filtering (4 reqs)
6. Deployment: Docker, volumes, config (4 reqs)

All 31 v1 requirements mapped to phases.

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-01-29)
+
+**Core value:** Capture and find anything from any device — especially laptop. If cross-device capture with images doesn't work, nothing else matters.
+**Current focus:** Phase 1 - Foundation
+
+## Current Position
+
+Phase: 1 of 6 (Foundation)
+Plan: 0 of 3 in current phase
+Status: Ready to plan
+Last activity: 2026-01-29 — 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:
+
+- None yet (project just initialized)
+
+### Pending Todos
+
+None yet.
+
+### Blockers/Concerns
+
+None yet.
+
+## Session Continuity
+
+Last session: 2026-01-29
+Stopped at: Roadmap created, ready for Phase 1 planning
+Resume file: None
+
+---
+*State initialized: 2026-01-29*