Remove CI/CD, unify Docker image for Docker Hub and HA add-on

- Remove GitHub Actions workflows (ci.yml, docker.yml, release.yml)
- Remove GoReleaser configuration
- Remove RELEASE.md (replaced by /release_strix skill)
- Add HA options.json support in config.go (reads /data/options.json)
- Add Version field to Config, pass real version to health endpoint
- Change Version from const to var, inject via ldflags at build time
- Add ARG VERSION to Dockerfile for build-time version injection
- Reset webui/package.json version to 0.0.0 (not used functionally)
- Clear probe fields on back navigation in frontend
- Add /release_strix and /release_strix_dev skills

.claude/skills/release_strix_dev/SKILL.md

@@ -0,0 +1,64 @@
+---
+name: release_strix_dev
+description: Build and push dev Docker image for Strix, update hassio-strix dev add-on version.
+disable-model-invocation: true
+---
+
+# Strix Dev Build
+
+You are building and pushing a dev image of Strix. Follow every step exactly. Do NOT ask any questions -- this is fully automated.
+
+## Repositories
+
+- Strix: `/home/user/Strix`
+- hassio-strix: `/home/user/hassio-strix`
+
+## Step 1: Get commit hash
+
+```bash
+cd /home/user/Strix
+git rev-parse --short HEAD
+```
+
+Store this as COMMIT_HASH (e.g. `fe93aa3`).
+
+## Step 2: Build Docker image
+
+```bash
+cd /home/user/Strix
+docker build --build-arg VERSION=dev-$COMMIT_HASH -t eduard256/strix:dev -t eduard256/strix:dev-$COMMIT_HASH .
+```
+
+## Step 3: Push to Docker Hub
+
+```bash
+docker push eduard256/strix:dev
+docker push eduard256/strix:dev-$COMMIT_HASH
+```
+
+## Step 4: Update hassio-strix
+
+```bash
+cd /home/user/hassio-strix
+git pull origin main
+```
+
+Edit `/home/user/hassio-strix/strix-dev/config.json` -- change `"version"` to `dev-$COMMIT_HASH`.
+
+```bash
+cd /home/user/hassio-strix
+git add strix-dev/config.json
+git commit -m "Dev build dev-$COMMIT_HASH"
+git push origin main
+```
+
+## Step 5: Report
+
+Output a summary:
+
+```
+Dev build complete:
+- Commit: $COMMIT_HASH
+- Docker Hub: eduard256/strix:dev, eduard256/strix:dev-$COMMIT_HASH (amd64)
+- hassio-strix: strix-dev version updated to dev-$COMMIT_HASH
+```