fix(daemon): ship the OpenRPC document inside the crate

docs/openrpc.json lived at the repository root, outside the soulseek-rs
package, so the include_str! in proto compiled from a checkout but not
from the published tarball - cargo publish failed verification and the
v13.0.0 release stopped after publishing the lib. The document moves
into the crate's own docs/, where packaging can see it; the generator
test and every link follow.

website/src/pages/docs.tsx

@@ -360,8 +360,8 @@ const Daemon = () => (
           <ExtLink href="https://open-rpc.org">OpenRPC</ExtLink> document. The daemon serves
           that document itself through <Code>rpc.discover</Code>, so a client can ask it what
           it can do. The same document is checked in at{' '}
-          <ExtLink href={`${LINKS.gh}/blob/master/docs/openrpc.json`}>
-            docs/openrpc.json
+          <ExtLink href={`${LINKS.gh}/blob/master/soulseek-rs/docs/openrpc.json`}>
+            soulseek-rs/docs/openrpc.json
           </ExtLink>{' '}
           on GitHub. <Code>auth</Code> answers with the protocol version, 1 today, so a
           client written against an older shape learns it at connect time.