docs: initialize NixOS Infrastructure with AI Assistant (4 phases)

Reproducible NixOS infrastructure with Docker service management and AI assistant integration.

Phases:
1. Foundation Setup: Core NixOS configuration with flakes
2. Docker Service Integration: Docker Compose integration and Traefik proxy
3. AI Assistant Integration: OpenCode AI assistant for infrastructure management
4. Automation & Monitoring: Service detection and health monitoring

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+**Core Value:** A reproducible and evolvable NixOS infrastructure that can be managed through natural language interactions with the OpenCode AI assistant
+**Current Focus:** Implement automatic detection and integration of Docker Compose services, AI assistant integration, service health monitoring, and automated system updates
+
+## Current Position
+
+Phase: 1 of 4 (Foundation Setup)
+Plan: Not started
+Status: Ready to plan
+Last activity: 2026-01-01 - Project initialized
+
+Progress: ░░░░░░░░░░ 0%
+
+## Performance Metrics
+
+**Velocity:**
+- Total plans completed: 0
+- Average duration: 0 min
+- Total execution time: 0.0 hours
+
+**By Phase:**
+
+| Phase | Plans | Total | Avg/Plan |
+|-------|-------|-------|----------|
+| - | - | - | - |
+
+**Recent Trend:**
+- Last 5 plans: []
+- Trend: [Not available]
+
+## Accumulated Context
+
+### Decisions Made
+
+| Phase | Decision | Rationale |
+|-------|----------|-----------|
+
+### Deferred Issues
+
+None yet.
+
+### Blockers/Concerns Carried Forward
+
+None yet.
+
+## Session Continuity
+
+Last session: 2026-01-01 00:00
+Stopped at: Project initialization complete
+Resume file: None