docs(06-01): complete docker configuration plan

Tasks completed: 3/3
- Switch to adapter-node with environment prefix
- Create Docker configuration files
- Update data paths for environment variable configuration

SUMMARY: .planning/phases/06-deployment/06-01-SUMMARY.md

.planning/phases/06-deployment/06-01-SUMMARY.md

@@ -0,0 +1,108 @@
+---
+phase: 06-deployment
+plan: 01
+subsystem: infra
+tags: [docker, docker-compose, adapter-node, sveltekit, alpine]
+
+# Dependency graph
+requires:
+  - phase: 01-foundation
+    provides: SQLite database configuration
+  - phase: 03-images
+    provides: Image storage paths
+provides:
+  - Docker multi-stage build configuration
+  - Production Node.js server via adapter-node
+  - docker-compose for single-command deployment
+  - Environment variable configuration for data paths
+affects: [06-02-health-endpoint]
+
+# Tech tracking
+tech-stack:
+  added: ["@sveltejs/adapter-node"]
+  patterns: ["Multi-stage Docker builds", "Non-root container user", "Environment variable prefixes"]
+
+key-files:
+  created:
+    - Dockerfile
+    - .dockerignore
+    - docker-compose.yml
+  modified:
+    - svelte.config.js
+    - src/lib/server/db/index.ts
+    - src/lib/server/images/storage.ts
+
+key-decisions:
+  - "TASKPLANER_ prefix for environment variables via adapter-node envPrefix"
+  - "Multi-stage Docker build for smaller production image"
+  - "Non-root 'nodejs' user (UID 1001) for container security"
+  - "Named volume taskplaner_data for persistent data"
+
+patterns-established:
+  - "Environment variables: Use TASKPLANER_ prefix for all app config"
+  - "Data paths: Read from TASKPLANER_DATA_DIR with ./data fallback"
+
+# Metrics
+duration: 2min
+completed: 2026-02-01
+---
+
+# Phase 6 Plan 1: Docker Configuration Summary
+
+**Multi-stage Docker build with adapter-node, non-root user, and environment variable configuration for production deployment**
+
+## Performance
+
+- **Duration:** 2 min 14 sec
+- **Started:** 2026-02-01T12:18:40Z
+- **Completed:** 2026-02-01T12:20:54Z
+- **Tasks:** 3
+- **Files modified:** 6
+
+## Accomplishments
+- Switched SvelteKit to adapter-node for production Node.js server
+- Created multi-stage Docker build with node:22-alpine base
+- Configured docker-compose with named volume for data persistence
+- Unified data path configuration via TASKPLANER_DATA_DIR environment variable
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Switch to adapter-node with environment prefix** - `3b9f434` (feat)
+2. **Task 2: Create Docker configuration files** - `5e31b69` (feat)
+3. **Task 3: Update data paths for environment variable configuration** - `457baca` (feat)
+
+## Files Created/Modified
+- `svelte.config.js` - Configured adapter-node with envPrefix: 'TASKPLANER_'
+- `Dockerfile` - Multi-stage build, non-root user, HEALTHCHECK
+- `.dockerignore` - Build context exclusions
+- `docker-compose.yml` - Single-service compose with taskplaner_data volume
+- `src/lib/server/db/index.ts` - Read DATA_DIR from environment
+- `src/lib/server/images/storage.ts` - Read DATA_DIR from environment
+
+## Decisions Made
+- Used TASKPLANER_ prefix for environment variables (matches adapter-node envPrefix)
+- Alpine-based image for smaller size (though 285MB due to sharp native dependencies)
+- Non-root nodejs user with UID 1001 for security
+- HEALTHCHECK configured for /health endpoint (to be created in Plan 02)
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+- Docker image size is 285MB instead of target <250MB. This is due to sharp native module dependencies which are necessary for image processing functionality. Acceptable tradeoff.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Docker configuration complete
+- Ready for Plan 02: Health endpoint and deployment documentation
+- HEALTHCHECK references /health endpoint which needs implementation
+
+---
+*Phase: 06-deployment*
+*Completed: 2026-02-01*