docs: remove JNI examples from README

Remove GPS, WiFi, and notification examples that used the jni library.
These examples belong in the jni project's own documentation, not here.

Author: xaionaro@dx.center

README.md

@@ -873,104 +873,6 @@ func main() {
 
 </details>
 
-<details>
-<summary>How to get GPS coordinates</summary>
-
-> **Library:** [jni](https://github.com/xaionaro-go/jni) — GPS is a Java-only API, not available via NDK.
-
-```go
-package main
-
-import (
-	"fmt"
-	"log"
-
-	"github.com/xaionaro-go/jni/location"
-)
-
-func main() {
-	mgr, err := location.NewManager()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	loc, err := mgr.LastKnownLocation("gps")
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	fmt.Printf("Lat: %f, Lon: %f\n", loc.Latitude, loc.Longitude)
-}
-```
-
-</details>
-
-<details>
-<summary>How to connect to a WiFi AP</summary>
-
-> **Library:** [jni](https://github.com/xaionaro-go/jni) — WiFi management is a Java-only API, not available via NDK.
-
-```go
-package main
-
-import (
-	"fmt"
-	"log"
-
-	"github.com/xaionaro-go/jni/net/wifi"
-)
-
-func main() {
-	mgr, err := wifi.NewManager()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	fmt.Println("WiFi enabled:", mgr.IsEnabled())
-
-	// Scan and connect (requires ACCESS_FINE_LOCATION permission).
-	if err := mgr.Connect("MySSID", "MyPassword"); err != nil {
-		log.Fatal(err)
-	}
-	fmt.Println("Connected to MySSID")
-}
-```
-
-</details>
-
-<details>
-<summary>How to send a notification</summary>
-
-> **Library:** [jni](https://github.com/xaionaro-go/jni) — Notifications require the Java SDK, not available via NDK.
-
-```go
-package main
-
-import (
-	"log"
-
-	"github.com/xaionaro-go/jni/app/notification"
-)
-
-func main() {
-	mgr, err := notification.NewManager()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	err = mgr.Notify("channel_default", notification.Builder{
-		Title: "Hello from Go",
-		Text:  "This notification was sent from a Go program.",
-		Icon:  "ic_launcher",
-	})
-	if err != nil {
-		log.Fatal(err)
-	}
-}
-```
-
-</details>
-
 <details>
 <summary>How to query battery status</summary>