Add shared link routing

[IstarVin]

• Add ShareLinkActivity to receive shared text and HTTP(S) link intents.
• Route supported provider links directly to Result View.
• Route supported extractor links directly to the player.
• Wait for plugin loading before showing unsupported-link feedback.
• Harden shared URL parsing, matching, and duplicate intent handling.

used AI

[LagradOst]

This functionallity already exists in

cloudstream/app/src/main/java/com/lagradost/cloudstream3/MainActivity.kt

Line 279 in 03eb6cc

fun handleAppIntentUrl(

Only "extractor links" is not implemented, so implement that here instead, it should be a 10line change.

[IstarVin]

the current implementation only handles links with "csshare:" which is from the built in share feature from the app.
this pull request would add an entry in the android share link which would accept direct https link which the app would match to its currently registered providers and redirect to the correct result view.