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-client/Cargo.toml

@@ -0,0 +1,103 @@
+[package]
+name        = "quicprochat-client"
+version     = "0.1.0"
+edition.workspace     = true
+description = "CLI client for quicprochat."
+license     = "Apache-2.0 OR MIT"
+repository.workspace  = true
+
+[[bin]]
+name = "qpc"
+path = "src/main.rs"
+
+[dependencies]
+quicprochat-core  = { path = "../quicprochat-core" }
+quicprochat-proto = { path = "../quicprochat-proto" }
+quicprochat-kt    = { path = "../quicprochat-kt" }
+openmls_rust_crypto = { workspace = true }
+
+# Serialisation + RPC
+capnp         = { workspace = true }
+capnp-rpc     = { workspace = true }
+
+# Async
+tokio         = { workspace = true }
+tokio-util    = { workspace = true }
+futures       = { workspace = true }
+serde         = { workspace = true }
+serde_json    = { workspace = true }
+bincode       = { workspace = true }
+
+# Crypto — OPAQUE PAKE
+opaque-ke     = { workspace = true }
+rand          = { workspace = true }
+
+# Error handling
+anyhow        = { workspace = true }
+thiserror     = { workspace = true }
+
+# Crypto — for fingerprint verification in fetch-key subcommand
+sha2          = { workspace = true }
+argon2        = { workspace = true }
+chacha20poly1305 = { workspace = true }
+ciborium      = { workspace = true }
+zeroize       = { workspace = true }
+quinn         = { workspace = true }
+quinn-proto   = { workspace = true }
+rustls        = { workspace = true }
+
+# Logging
+tracing       = { workspace = true }
+tracing-subscriber = { workspace = true }
+
+# CLI
+clap          = { workspace = true }
+
+# Local message/conversation storage
+rusqlite      = { workspace = true }
+
+# Hex encoding/decoding
+hex           = { workspace = true }
+
+# Secure password prompting (no echo)
+rpassword     = "5"
+
+# mDNS discovery for mesh mode (Freifunk). Only compiled with --features mesh.
+mdns-sd = { version = "0.12", optional = true }
+
+# Optional P2P transport for direct node-to-node messaging.
+quicprochat-p2p = { path = "../quicprochat-p2p", optional = true }
+
+# Optional TUI dependencies (Ratatui full-screen interface).
+ratatui = { version = "0.29", optional = true, default-features = false, features = ["crossterm"] }
+crossterm = { version = "0.28", optional = true }
+
+# YAML playbook parsing (only compiled with --features playbook).
+serde_yaml = { version = "0.9", optional = true }
+
+# v2 SDK-based CLI (thin shell over quicprochat-sdk).
+quicprochat-sdk = { path = "../quicprochat-sdk", optional = true }
+quicprochat-rpc = { path = "../quicprochat-rpc", optional = true }
+rustyline      = { workspace = true, optional = true }
+
+[lints]
+workspace = true
+
+[features]
+# Enable mesh-mode features: mDNS local peer discovery + P2P transport.
+# Build: cargo build -p quicprochat-client --features mesh
+mesh = ["dep:mdns-sd", "dep:quicprochat-p2p"]
+# Enable full-screen Ratatui TUI: cargo build -p quicprochat-client --features tui
+tui = ["dep:ratatui", "dep:crossterm"]
+# Enable playbook (scripted command execution): YAML parser + serde derives.
+# Build: cargo build -p quicprochat-client --features playbook
+playbook = ["dep:serde_yaml"]
+# v2 CLI over SDK: cargo build -p quicprochat-client --features v2
+v2 = ["dep:quicprochat-sdk", "dep:quicprochat-rpc", "dep:rustyline"]
+
+[dev-dependencies]
+dashmap       = { workspace = true }
+assert_cmd    = "2"
+tempfile      = "3"
+portpicker    = "0.1"
+rand          = "0.8"