Move ~39 inline SQL queries from six handler files into repo_guild.go,
consolidating all guild-related DB access (posts, alliances, adventures,
treasure hunts, meals, kill logs, scouts) behind GuildRepository methods.
Handler files now contain only packet serialization, business logic, and
ACK responses with no direct database calls.
Per anti-patterns.md item #9, guild-related SQL was scattered across
~15 handler files with no repository abstraction. Following the same
pattern established by CharacterRepository, this centralizes all
guilds, guild_characters, and guild_applications table access into a
single GuildRepository (~30 methods).
guild_model.go and handlers_guild_member.go are trimmed to types and
pure business logic only. All handler files (guild_*, festa, mail,
house, mercenary, rengoku) now call s.server.guildRepo methods
instead of direct DB queries or methods on domain objects.
Add package-level documentation (doc.go) to all 22 first-party
packages and godoc comments to ~150 previously undocumented
exported symbols across common/, network/, and server/.
