major: kestrel is now a tak server (#6)

## Added

- CoT (Cursor on Target) server on port 8089 enabling ATAK/iTAK device connectivity
- Support for TAK stream protocol and traditional XML CoT messages
- TLS/SSL support with automatic fallback to plain TCP
- Username/password authentication for CoT connections
- Real-time device position tracking with TTL-based expiration (90s default)
- API endpoints: `/api/cot/config`, `/api/cot/server-package`, `/api/cot/truststore`, `/api/me/cot-password`
- TAK Server section in Settings with QR code for iTAK setup
- ATAK password management in Account page for OIDC users
- CoT device markers on map showing real-time positions
- Comprehensive documentation in `docs/` directory
- Environment variables: `COT_PORT`, `COT_TTL_MS`, `COT_REQUIRE_AUTH`, `COT_SSL_CERT`, `COT_SSL_KEY`, `COT_DEBUG`
- Dependencies: `fast-xml-parser`, `jszip`, `qrcode`

## Changed

- Authentication system supports CoT password management for OIDC users
- Database schema includes `cot_password_hash` field
- Test suite refactored to follow functional design principles

## Removed

- Consolidated utility modules: `authConfig.js`, `authSkipPaths.js`, `bootstrap.js`, `poiConstants.js`, `session.js`

## Security

- XML entity expansion protection in CoT parser
- Enhanced input validation and SQL injection prevention
- Authentication timeout to prevent hanging connections

## Breaking Changes

- Port 8089 must be exposed for CoT server. Update firewall rules and Docker/Kubernetes configurations.

## Migration Notes

- OIDC users must set ATAK password via Account settings before connecting
- Docker: expose port 8089 (`-p 8089:8089`)
- Kubernetes: update Helm values to expose port 8089

Co-authored-by: Madison Grubb <madison@elastiflow.com>
Reviewed-on: #6

server/api/live/[id].patch.js

@@ -1,31 +1,57 @@
 import { requireAuth } from '../../utils/authHelpers.js'
 import { getLiveSession, updateLiveSession } from '../../utils/liveSessions.js'
+import { acquire } from '../../utils/asyncLock.js'
 
 export default defineEventHandler(async (event) => {
   const user = requireAuth(event)
   const id = event.context.params?.id
   if (!id) throw createError({ statusCode: 400, message: 'id required' })
 
-  const session = getLiveSession(id)
-  if (!session) throw createError({ statusCode: 404, message: 'Live session not found' })
-  if (session.userId !== user.id) throw createError({ statusCode: 403, message: 'Forbidden' })
-
   const body = await readBody(event).catch(() => ({}))
   const lat = Number(body?.lat)
   const lng = Number(body?.lng)
   const updates = {}
   if (Number.isFinite(lat)) updates.lat = lat
   if (Number.isFinite(lng)) updates.lng = lng
-  if (Object.keys(updates).length) {
-    updateLiveSession(id, updates)
+  if (Object.keys(updates).length === 0) {
+    // No updates, just return current session
+    const session = getLiveSession(id)
+    if (!session) throw createError({ statusCode: 404, message: 'Live session not found' })
+    if (session.userId !== user.id) throw createError({ statusCode: 403, message: 'Forbidden' })
+    return {
+      id: session.id,
+      label: session.label,
+      lat: session.lat,
+      lng: session.lng,
+      updatedAt: session.updatedAt,
+    }
   }
 
-  const updated = getLiveSession(id)
-  return {
-    id: updated.id,
-    label: updated.label,
-    lat: updated.lat,
-    lng: updated.lng,
-    updatedAt: updated.updatedAt,
-  }
+  // Use lock to atomically check and update session
+  return await acquire(`session-patch-${id}`, async () => {
+    const session = getLiveSession(id)
+    if (!session) throw createError({ statusCode: 404, message: 'Live session not found' })
+    if (session.userId !== user.id) throw createError({ statusCode: 403, message: 'Forbidden' })
+
+    try {
+      const updated = await updateLiveSession(id, updates)
+      // Re-verify after update (updateLiveSession throws if session not found)
+      if (!updated || updated.userId !== user.id) {
+        throw createError({ statusCode: 404, message: 'Live session not found' })
+      }
+      return {
+        id: updated.id,
+        label: updated.label,
+        lat: updated.lat,
+        lng: updated.lng,
+        updatedAt: updated.updatedAt,
+      }
+    }
+    catch (err) {
+      if (err.message === 'Session not found') {
+        throw createError({ statusCode: 404, message: 'Live session not found' })
+      }
+      throw err
+    }
+  })
 })