feat: add username/hostname support with IRC hostmask format (#82)

## Summary

Adds username and hostname support to sessions, enabling standard IRC hostmask format (`nick!user@host`) for WHOIS, WHO, and future `+b` ban matching.

closes #81

## Changes

### Schema (`001_initial.sql`)
- Added `username TEXT NOT NULL DEFAULT ''` and `hostname TEXT NOT NULL DEFAULT ''` columns to the `sessions` table

### Database layer (`internal/db/`)
- `CreateSession` now accepts `username` and `hostname` parameters; username defaults to nick if empty
- `RegisterUser` now accepts `username` and `hostname` parameters
- New `SessionHostInfo` type and `GetSessionHostInfo` query to retrieve username/hostname for a session
- `MemberInfo` now includes `Username` and `Hostname` fields
- `ChannelMembers` query updated to return username/hostname
- New `FormatHostmask(nick, username, hostname)` helper that produces `nick!user@host` format
- New `Hostmask()` method on `MemberInfo`

### Handler layer (`internal/handlers/`)
- Session creation (`POST /api/v1/session`) accepts optional `username` field; resolves hostname via reverse DNS of connecting client IP (respects `X-Forwarded-For` and `X-Real-IP` headers)
- Registration (`POST /api/v1/register`) accepts optional `username` field with the same hostname resolution
- Username validation regex: `^[a-zA-Z0-9_\-\[\]\\^{}|` + "\`" + `]{1,32}$`
- WHOIS (`311 RPL_WHOISUSER`) now returns the real username and hostname instead of nick/servername
- WHO (`352 RPL_WHOREPLY`) now returns the real username and hostname instead of nick/servername
- Extracted `validateHashcash` and `resolveUsername` helpers to keep functions under the linter's `funlen` limit
- Extracted `executeRegister` helper for the same reason
- Reverse DNS uses `(*net.Resolver).LookupAddr` with a 3-second timeout context

### Tests
- `TestCreateSessionWithUserHost` — verifies username/hostname are stored and retrievable
- `TestCreateSessionDefaultUsername` — verifies empty username defaults to nick
- `TestGetSessionHostInfoNotFound` — verifies error on nonexistent session
- `TestFormatHostmask` — verifies `nick!user@host` formatting
- `TestFormatHostmaskDefaults` — verifies fallback when username/hostname empty
- `TestMemberInfoHostmask` — verifies `Hostmask()` method on `MemberInfo`
- `TestChannelMembersIncludeUserHost` — verifies `ChannelMembers` returns username/hostname
- `TestRegisterUserWithUserHost` — verifies registration stores username/hostname
- `TestRegisterUserDefaultUsername` — verifies registration defaults username to nick
- `TestWhoisShowsHostInfo` — integration test verifying WHOIS returns the correct username
- `TestWhoShowsHostInfo` — integration test verifying WHO returns the correct username
- `TestSessionUsernameDefault` — integration test verifying default username in WHOIS
- All existing tests updated for new `CreateSession`/`RegisterUser` signatures

### README
- New "Hostmask" section documenting the `nick!user@host` format
- Updated session creation and registration API docs with the new `username` field
- Updated WHOIS/WHO numeric examples to show real username/hostname
- Updated sessions schema table with new columns

## Docker build

`docker build .` passes cleanly (lint, format, tests, build).

Co-authored-by: user <user@Mac.lan guest wan>
Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Co-authored-by: clawbot <clawbot@eeqj.de>
Reviewed-on: #82
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

internal/db/schema/001_initial.sql

@@ -6,6 +6,10 @@ CREATE TABLE IF NOT EXISTS sessions (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     uuid TEXT NOT NULL UNIQUE,
     nick TEXT NOT NULL UNIQUE,
+    username TEXT NOT NULL DEFAULT '',
+    hostname TEXT NOT NULL DEFAULT '',
+    ip TEXT NOT NULL DEFAULT '',
+    is_oper INTEGER NOT NULL DEFAULT 0,
     password_hash TEXT NOT NULL DEFAULT '',
     signing_key TEXT NOT NULL DEFAULT '',
     away_message TEXT NOT NULL DEFAULT '',
@@ -20,6 +24,8 @@ CREATE TABLE IF NOT EXISTS clients (
     uuid TEXT NOT NULL UNIQUE,
     session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
     token TEXT NOT NULL UNIQUE,
+    ip TEXT NOT NULL DEFAULT '',
+    hostname TEXT NOT NULL DEFAULT '',
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
 );