Proto commits in ptt/pttweb

These 5 commits are when the Protocol Buffers files have changed:

Commit:fcf94a4
Author:Robert Wang
Committer:Robert Wang

api: Search API proto.

The documentation is generated from this commit.

Commit:5830756
Author:robertabcd

api: Shoule use uint32 for bid in BoardRef.

Commit:49d66c1
Author:Robert
Committer:Robert

Import boardd api.

Commit:2443adf
Author:Robert

Move man service to proto/man.

Commit:3bedf71
Author:Robert
Committer:Robert

Add man support.