feat(rdp): text clipboard sharing in both directions

A CLIPRDR channel with a text-only backend (CF_UNICODETEXT): text copied
on the remote desktop is fetched and goes through the app's remote-
clipboard preference like VNC and OSC 52; local text is offered to the
remote when the desktop gains focus, on Ctrl+V and with Paste Clipboard
(which no longer types the text). Backend callbacks run inside the
active stage, so they queue requests that the session loop sends.

Verified against xrdp: the remote X clipboard read back the offered
text, and a remote copy arrived through on_clipboard.

rust/Cargo.lock

@@ -2767,6 +2767,7 @@ version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0f910b8dc8e7b8e001c61fd742be442e8604fb2499ded713cadf911e7645ade4"
 dependencies = [
+ "ironrdp-cliprdr",
  "ironrdp-connector",
  "ironrdp-core",
  "ironrdp-displaycontrol",
@@ -2797,6 +2798,19 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2e548d9fd162558a5a8aaed72e528556ce88e77773634e3722b8d01d6f170388"
 
+[[package]]
+name = "ironrdp-cliprdr"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb9050999a1e032f4313788ac5a6d06e897a4f672f1de2ed98683001fc1abf56"
+dependencies = [
+ "bitflags 2.13.2",
+ "ironrdp-core",
+ "ironrdp-pdu",
+ "ironrdp-svc",
+ "tracing",
+]
+
 [[package]]
 name = "ironrdp-connector"
 version = "0.10.0"