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-proto/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "quicprochat-proto"
+version = "0.2.0"
+edition.workspace = true
+description = "Protocol types for quicprochat — v1 Cap'n Proto (legacy) + v2 Protobuf (prost)"
+license     = "Apache-2.0 OR MIT"
+repository.workspace = true
+
+build = "build.rs"
+
+[dependencies]
+# v1 legacy (Cap'n Proto) — used by existing server/client until rewrite
+capnp       = { workspace = true }
+
+# v2 (Protobuf via prost) — new RPC types
+prost       = { workspace = true }
+prost-types = { workspace = true }
+bytes       = { workspace = true }
+
+[build-dependencies]
+capnpc      = { workspace = true }
+prost-build = { workspace = true }
+protobuf-src = "2"
+
+[lints.rust]
+unsafe_code = "warn"
+
+[lints.clippy]
+# Generated Cap'n Proto code uses patterns that trigger clippy lints.
+unwrap_used = "allow"