backend: forward keyboard and mouse input from client

Cargo.lock

@@ -537,6 +537,16 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
 
+[[package]]
+name = "flatbuffers"
+version = "25.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1045398c1bfd89168b5fd3f1fc11f6e70b34f6f66300c87d44d3de849463abf1"
+dependencies = [
+ "bitflags",
+ "rustc_version",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -668,6 +678,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "directories",
+ "flatbuffers",
  "getrandom 0.3.3",
  "hex",
  "hmac-sha256",
@@ -2038,6 +2049,15 @@ version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
 
+[[package]]
+name = "rustc_version"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
+dependencies = [
+ "semver",
+]
+
 [[package]]
 name = "rustix"
 version = "1.0.7"
@@ -2443,6 +2463,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "semver"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56e6fa9c48d24d85fb3de5ad847117517440f6beceb7798af16b4a87d616b8d0"
+
 [[package]]
 name = "serde"
 version = "1.0.219"