Adding more fields to the all nodes table

[javuto]

Summary

This branch adds quick node posture, health, and tag visibility to the all-nodes table and single-node detail view.

Changes

Node API Projection

• Extends NodeView with:
  • posture.risk_level
  • tags
  • health.status
  • health.reason
  • health.signals
• Adds server-side node health calculation:
  • offline when the node is inactive
  • at_risk for high/critical posture risk
  • attention for medium or unknown posture
  • healthy for active nodes with low/no risk
• Loads posture summaries and tags during single-node and paginated node projection.
• Adds batch tag loading by node IDs to avoid per-row tag queries.

Posture Summary

• Adds posture summary helpers to calculate compact node risk from posture records.
• Supports single-node and batch posture risk summary lookup.

All Nodes Table

• Adds dedicated Health and Tags columns.
• Adds a posture column when posture is enabled.
• Keeps Activity focused on last seen and bytes received.
• Displays posture risk as a colored badge: low, medium, or high.
• Displays uptime alongside posture risk when posture is enabled.

Single Node View

• Adds a Health section in the Details tab.
• Shows:
  • health badge
  • health reason
  • calculation signals
  • all node tags

Frontend Shared Components

• Adds reusable node signal rendering for:
  • health badges
  • tag chips

Tests

• Adds backend tests for:
  • node health projection
  • posture risk projection
  • node tag projection
  • batch tag lookup
• Adds frontend tests for:
  • all-nodes Health and Tags columns
  • posture column behavior
  • node detail Health and Tags section

Validation

• npm test -- NodesTablePage.test.tsx
• npm test -- NodeDetailPage.test.tsx
• npm run check
• GOCACHE=/tmp/osctrl-gocache go test ./pkg/tags ./pkg/types ./pkg/posture ./cmd/api/handlers
• GOCACHE=/tmp/osctrl-gocache go test ./cmd/api/handlers
• git diff --check