user 8d91ad852c Replace HTTP status codes with IRC numeric replies in command handlers (closes #54) ...

IRC command handlers now return proper IRC numeric reply codes per
RFC 1459/2812 instead of HTTP status codes:

- 401 ERR_NOSUCHNICK for unknown DM targets
- 403 ERR_NOSUCHCHANNEL for invalid/missing channels
- 411 ERR_NORECIPIENT for missing message recipients
- 412 ERR_NOTEXTTOSEND for missing message body
- 421 ERR_UNKNOWNCOMMAND for unknown/empty commands
- 431 ERR_NONICKNAMEGIVEN for missing nick in NICK command
- 432 ERR_ERRONEUSNICKNAME for invalid nick format
- 433 ERR_NICKNAMEINUSE for taken nicks
- 442 ERR_NOTONCHANNEL for non-member channel actions
- 461 ERR_NEEDMOREPARAMS for missing required parameters

Error responses use the IRC numeric format:
  {"command":"4xx","from":"server","to":"nick","body":["..."],"params":[...]}

HTTP status codes are now reserved for transport-level concerns:
- 400 for malformed HTTP requests (bad JSON)
- 401 for authentication failures
- 500 for internal server errors

Successful message sends changed from 201 to 200 since HTTP
status codes should not encode IRC-level semantics.

2026-03-08 01:16:04 -08:00

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