chore: rename quicproquo → quicprochat in Rust workspace

Rename all crate directories, package names, binary names, proto
package/module paths, ALPN strings, env var prefixes, config filenames,
mDNS service names, and plugin ABI symbols from quicproquo/qpq to
quicprochat/qpc.

crates/quicprochat-rpc/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "quicprochat-rpc"
+version = "0.1.0"
+edition.workspace = true
+description = "QUIC RPC framework for quicprochat v2 — framing, dispatch, tower middleware"
+license     = "Apache-2.0 OR MIT"
+repository.workspace = true
+
+[dependencies]
+quicprochat-proto = { path = "../quicprochat-proto" }
+prost            = { workspace = true }
+bytes            = { workspace = true }
+quinn            = { workspace = true }
+rustls           = { workspace = true }
+rcgen            = { workspace = true }
+tokio            = { workspace = true }
+futures          = { workspace = true }
+tower            = { workspace = true }
+tracing          = { workspace = true }
+thiserror        = { workspace = true }
+dashmap          = { workspace = true }
+sha2             = { workspace = true }
+uuid             = { version = "1", features = ["v7"] }
+metrics          = "0.22"
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["test-util"] }
+
+[lints]
+workspace = true