fix: replace JWT tokens in URL query params with short-lived ephemeral tokens

Addresses CWE-598: long-lived JWTs were exposed in WebSocket URLs, file
download links, and Immich asset proxy URLs, leaking into server logs,
browser history, and Referer headers.

- Add ephemeralTokens service: in-memory single-use tokens with per-purpose
  TTLs (ws=30s, download/immich=60s), max 10k entries, periodic cleanup
- Add POST /api/auth/ws-token and POST /api/auth/resource-token endpoints
- WebSocket auth now consumes an ephemeral token instead of verifying the JWT
  directly from the URL; client fetches a fresh token before each connect
- File download ?token= query param now accepts ephemeral tokens; Bearer
  header path continues to accept JWTs for programmatic access
- Immich asset proxy replaces authFromQuery JWT injection with ephemeral token
  consumption
- Client: new getAuthUrl() utility, AuthedImg/ImmichImg components, and async
  onClick handlers replace the synchronous authUrl() pattern throughout
  FileManager, PlaceInspector, and MemoriesPanel
- Add OIDC_DISCOVERY_URL env var and oidc_discovery_url DB setting to allow
  overriding the auto-constructed discovery endpoint (required for Authentik
  and similar providers); exposed in the admin UI and .env.example

client/src/components/Planner/PlaceInspector.tsx

@@ -1,10 +1,5 @@
 import React, { useState, useEffect, useRef, useCallback, useMemo } from 'react'
-
-function authUrl(url: string): string {
-  const token = localStorage.getItem('auth_token')
-  if (!token || !url) return url
-  return `${url}${url.includes('?') ? '&' : '?'}token=${token}`
-}
+import { getAuthUrl } from '../../api/authUrl'
 import { X, Clock, MapPin, ExternalLink, Phone, Euro, Edit2, Trash2, Plus, Minus, ChevronDown, ChevronUp, FileText, Upload, File, FileImage, Star, Navigation, Users, Mountain, TrendingUp } from 'lucide-react'
 import PlaceAvatar from '../shared/PlaceAvatar'
 import { mapsApi } from '../../api/client'
@@ -587,11 +582,11 @@ export default function PlaceInspector({
               {filesExpanded && placeFiles.length > 0 && (
                 <div style={{ padding: '0 12px 10px', display: 'flex', flexDirection: 'column', gap: 4 }}>
                   {placeFiles.map(f => (
-                    <a key={f.id} href={authUrl(f.url)} target="_blank" rel="noopener noreferrer" style={{ display: 'flex', alignItems: 'center', gap: 8, textDecoration: 'none', cursor: 'pointer' }}>
+                    <button key={f.id} onClick={async () => { const u = await getAuthUrl(f.url, 'download'); window.open(u, '_blank', 'noopener noreferrer') }} style={{ display: 'flex', alignItems: 'center', gap: 8, textDecoration: 'none', cursor: 'pointer', background: 'none', border: 'none', width: '100%', textAlign: 'left' }}>
                       {(f.mime_type || '').startsWith('image/') ? <FileImage size={12} color="#6b7280" /> : <File size={12} color="#6b7280" />}
                       <span style={{ fontSize: 12, color: 'var(--text-secondary)', flex: 1, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{f.original_name}</span>
                       {f.file_size && <span style={{ fontSize: 11, color: 'var(--text-faint)', flexShrink: 0 }}>{formatFileSize(f.file_size)}</span>}
-                    </a>
+                    </button>
                   ))}
                 </div>
               )}