Add a Host trait and move DB/model commands off Tauri

Command handlers took Tauri types, so running them anywhere else meant
rewriting them. `yaak_commands::Host` is what a handler actually needs
from its surroundings: who the client is, what it's looking at, and the
shared managers. Handlers are generic over it and keep the router's
shape, so another host registers one with rpc_handler_async! and no
adapter at all.

28 commands move: models, deletes, response reads, encryption, plugin
info, export. ClientCtx implements Host, so the desktop adapters are one
line and behavior is unchanged.

PluginHost is separate because PluginManager is "spawn a Node sidecar
and talk to it" — a browser host runs plugins in a worker and can't hand
one back. Only 4 of the 28 need it; the rest work without a plugin
runtime, and the compiler says which is which.

Also drops yaak_core::AppContext, an earlier sketch of this that was
never implemented.

crates-tauri/yaak-app-client/Cargo.toml

@@ -80,6 +80,7 @@ yaak-common = { workspace = true }
 yaak-tauri-utils = { workspace = true }
 yaak-core = { workspace = true }
 yaak = { workspace = true }
+yaak-commands = { workspace = true }
 yaak-crypto = { workspace = true }
 yaak-fonts = { workspace = true }
 yaak-git = { workspace = true }