feat(import): selective GPX/KML element import and performance improvements

Add type-selector UI in the file import modal letting users choose which
GPX elements (waypoints, routes, tracks) or KML/KMZ elements (points,
paths) to import. KML LineString placemarks are now imported as path
places with route_geometry.

Performance improvements:
- Extract MemoPlaceRow with React.memo and contentVisibility:auto to cut
  unnecessary re-renders in PlacesSidebar
- Add weatherQueue to cap concurrent weather fetches at 3
- Replace sequential per-place deletes with a single bulkDelete API call
  (new DELETE /places/bulk endpoint + deletePlacesMany service)
- Memoize atlas/photo/weather service calls to avoid redundant requests
- Add multi-select mode to PlacesSidebar for bulk operations

Add large GPX/KML/KMZ fixtures for integration/perf testing and two
profiler analysis scripts under scripts/.

client/src/components/Weather/WeatherWidget.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react'
 import { Sun, Cloud, CloudRain, CloudSnow, CloudDrizzle, CloudLightning, Wind } from 'lucide-react'
-import { weatherApi } from '../../api/client'
+import { fetchWeather } from '../../services/weatherQueue'
 import { useSettingsStore } from '../../store/settingsStore'
 
 const WEATHER_ICON_MAP = {
@@ -61,7 +61,7 @@ export default function WeatherWidget({ lat, lng, date, compact = false }: Weath
       // Climate data: use from cache but re-fetch in background to upgrade to forecast
       else if (cached.type === 'climate') {
         setWeather(cached)
-        weatherApi.get(lat, lng, date)
+        fetchWeather(lat, lng, date)
           .then(data => {
             if (!data.error && data.temp !== undefined && data.type === 'forecast') {
               setWeatherCache(cacheKey, data)
@@ -77,7 +77,7 @@ export default function WeatherWidget({ lat, lng, date, compact = false }: Weath
       return
     }
     setLoading(true)
-    weatherApi.get(lat, lng, date)
+    fetchWeather(lat, lng, date)
       .then(data => {
         if (data.error || data.temp === undefined) {
           setFailed(true)