feat: native Headlamp integration, TrueNAS API, docs, and CI for v0.2.0

Native Headlamp integrations:
- registerResourceTableColumnsProcessor: add Protocol/Pool/Server columns to
  native StorageClass table and Protocol/Volume Handle to PV table
- registerDetailsViewSection: inject TNS-CSI section into PV detail pages
- registerDetailsViewSection: inject driver role/status into tns-csi Pod pages
- registerDetailsViewHeaderAction: Benchmark shortcut on StorageClass detail
- registerAppBarAction: driver health badge (N/Nc M/Mn, color-coded)
- Trim sidebar from 6 → 4 entries (Overview, Snapshots, Metrics, Benchmark)

TrueNAS API integration:
- src/api/truenas.ts: ConfigStore-backed settings, WebSocket JSON-RPC client
  for pool.query (auth.login_with_api_key + pool.query)
- src/components/TnsCsiSettings.tsx: API key + server override settings UI
  with connection test button
- TnsCsiDataContext: fetch real pool stats (size/allocated/free/status)
- OverviewPage: three-tier pool capacity display (real data → error → metrics
  fallback)

Documentation:
- README, CHANGELOG, CONTRIBUTING, SECURITY
- docs/: architecture, deployment (Helm), getting-started, user-guide,
  troubleshooting

CI:
- .github/workflows/ci.yaml: lint + type-check + test on PR/push
- .github/workflows/release.yaml: workflow_dispatch versioned release

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

docs/README.md

@@ -0,0 +1,73 @@
+# TNS-CSI Plugin Documentation
+
+Welcome to the Headlamp TNS-CSI Plugin documentation.
+
+## Quick Links
+
+- **[Quick Start](getting-started/quick-start.md)** — Get up and running in 5 minutes
+- **[Installation Guide](getting-started/installation.md)** — All installation methods
+- **[Troubleshooting](troubleshooting/README.md)** — Common issues and fixes
+
+## Documentation Index
+
+### Getting Started
+
+| Guide | Description |
+| ----- | ----------- |
+| [Quick Start](getting-started/quick-start.md) | Fastest path to a working installation |
+| [Installation](getting-started/installation.md) | Plugin Manager, manual tarball, build from source |
+| [Prerequisites](getting-started/prerequisites.md) | Headlamp version, tns-csi driver, RBAC |
+
+### User Guide
+
+| Guide | Description |
+| ----- | ----------- |
+| [Overview Dashboard](user-guide/overview.md) | Driver health, storage summary, protocol distribution |
+| [Storage Classes](user-guide/storage-classes.md) | StorageClass list and detail panel |
+| [Volumes](user-guide/volumes.md) | PersistentVolume list and detail panel |
+| [Snapshots](user-guide/snapshots.md) | VolumeSnapshot list and CRD requirements |
+| [Metrics](user-guide/metrics.md) | Prometheus metrics display |
+| [Benchmark](user-guide/benchmark.md) | kbench interactive storage benchmarking |
+| [PVC Detail Injection](user-guide/pvc-detail.md) | TNS-CSI section in PVC detail views |
+| [RBAC Permissions](user-guide/rbac.md) | Required permissions per feature |
+
+### Architecture
+
+| Guide | Description |
+| ----- | ----------- |
+| [Overview](architecture/overview.md) | System architecture, data flow, component hierarchy |
+| [Data Flow](architecture/data-flow.md) | How data moves from K8s API to the UI |
+| [Design Decisions](architecture/design-decisions.md) | Key architectural choices and rationale |
+
+### Deployment
+
+| Guide | Description |
+| ----- | ----------- |
+| [Helm](deployment/helm.md) | Deploy with Helm (recommended) |
+| [Production Checklist](deployment/production.md) | Security and reliability checklist |
+
+### Troubleshooting
+
+| Guide | Description |
+| ----- | ----------- |
+| [Common Issues](troubleshooting/README.md) | Quick diagnosis table |
+| [RBAC Issues](troubleshooting/rbac.md) | 403 errors, missing permissions |
+| [Driver Detection](troubleshooting/driver.md) | Driver not installed, wrong provisioner |
+| [Metrics Issues](troubleshooting/metrics.md) | Empty metrics page, unreachable controller |
+| [Benchmark Issues](troubleshooting/benchmark.md) | Benchmark fails to start or complete |
+
+### Development
+
+| Guide | Description |
+| ----- | ----------- |
+| [Development Setup](development/setup.md) | Clone, install, run dev server |
+| [Testing](development/testing.md) | Unit tests, mocking headlamp APIs |
+| [Release Process](development/release.md) | How releases are cut and published |
+
+## External Links
+
+- **[GitHub Repository](https://github.com/privilegedescalation/headlamp-tns-csi-plugin)**
+- **[Artifact Hub](https://artifacthub.io/packages/headlamp/headlamp-tns-csi-plugin/headlamp-tns-csi-plugin)**
+- **[tns-csi Driver](https://github.com/fenio/tns-csi)**
+- **[kbench](https://github.com/longhorn/kbench)**
+- **[Headlamp](https://headlamp.dev/)**