refactor: remove persister abstraction layer

Inline persistence logic directly into game stores and handlers:
- game/persist.go: DB mapping methods on GameStore and GameInstance
- snake/persist.go: DB mapping methods on SnakeStore and SnakeGameInstance
- Chat persistence inlined into c4game handlers
- Delete db/persister.go (GamePersister, SnakePersister, ChatPersister)
- Stores now take *repository.Queries directly instead of Persister interface

snake/store.go

@@ -1,36 +1,28 @@
 package snake
 
 import (
+	"context"
 	"crypto/rand"
 	"encoding/hex"
 	"sync"
+
+	"github.com/ryanhamamura/c4/db/repository"
 )
 
-type Persister interface {
-	SaveSnakeGame(sg *SnakeGame) error
-	LoadSnakeGame(id string) (*SnakeGame, error)
-	SaveSnakePlayer(gameID string, player *Player) error
-	LoadSnakePlayers(gameID string) ([]*Player, error)
-	DeleteSnakeGame(id string) error
-}
-
 type SnakeStore struct {
-	games     map[string]*SnakeGameInstance
-	gamesMu   sync.RWMutex
-	persister  Persister
+	games      map[string]*SnakeGameInstance
+	gamesMu    sync.RWMutex
+	queries    *repository.Queries
 	notifyFunc func(gameID string)
 }
 
-func NewSnakeStore() *SnakeStore {
+func NewSnakeStore(queries *repository.Queries) *SnakeStore {
 	return &SnakeStore{
-		games: make(map[string]*SnakeGameInstance),
+		games:   make(map[string]*SnakeGameInstance),
+		queries: queries,
 	}
 }
 
-func (ss *SnakeStore) SetPersister(p Persister) {
-	ss.persister = p
-}
-
 func (ss *SnakeStore) SetNotifyFunc(f func(gameID string)) {
 	ss.notifyFunc = f
 }
@@ -60,18 +52,18 @@ func (ss *SnakeStore) Create(width, height int, mode GameMode, speed int) *Snake
 		Speed:   speed,
 	}
 	si := &SnakeGameInstance{
-		game:      sg,
-		notify:    ss.makeNotify(id),
-		persister: ss.persister,
-		store:     ss,
+		game:    sg,
+		notify:  ss.makeNotify(id),
+		queries: ss.queries,
+		store:   ss,
 	}
 
 	ss.gamesMu.Lock()
 	ss.games[id] = si
 	ss.gamesMu.Unlock()
 
-	if ss.persister != nil {
-		ss.persister.SaveSnakeGame(sg)
+	if ss.queries != nil {
+		ss.saveSnakeGame(sg)
 	}
 
 	return si
@@ -86,16 +78,16 @@ func (ss *SnakeStore) Get(id string) (*SnakeGameInstance, bool) {
 		return si, true
 	}
 
-	if ss.persister == nil {
+	if ss.queries == nil {
 		return nil, false
 	}
 
-	sg, err := ss.persister.LoadSnakeGame(id)
+	sg, err := ss.loadSnakeGame(id)
 	if err != nil || sg == nil {
 		return nil, false
 	}
 
-	players, _ := ss.persister.LoadSnakePlayers(id)
+	players, _ := ss.loadSnakePlayers(id)
 	if sg.Players == nil {
 		sg.Players = make([]*Player, 8)
 	}
@@ -106,10 +98,10 @@ func (ss *SnakeStore) Get(id string) (*SnakeGameInstance, bool) {
 	}
 
 	si = &SnakeGameInstance{
-		game:      sg,
-		notify:    ss.makeNotify(id),
-		persister: ss.persister,
-		store:     ss,
+		game:    sg,
+		notify:  ss.makeNotify(id),
+		queries: ss.queries,
+		store:   ss,
 	}
 
 	ss.gamesMu.Lock()
@@ -129,8 +121,8 @@ func (ss *SnakeStore) Delete(id string) error {
 		si.Stop()
 	}
 
-	if ss.persister != nil {
-		return ss.persister.DeleteSnakeGame(id)
+	if ss.queries != nil {
+		return ss.queries.DeleteSnakeGame(context.Background(), id)
 	}
 	return nil
 }
@@ -158,14 +150,14 @@ func (ss *SnakeStore) ActiveGames() []*SnakeGame {
 }
 
 type SnakeGameInstance struct {
-	game           *SnakeGame
-	gameMu         sync.RWMutex
+	game            *SnakeGame
+	gameMu          sync.RWMutex
 	pendingDirQueue [8][]Direction // queued directions per slot (max 3)
-	notify         func()
-	persister      Persister
-	store          *SnakeStore
-	stopCh         chan struct{}
-	loopOnce       sync.Once
+	notify          func()
+	queries         *repository.Queries
+	store           *SnakeStore
+	stopCh          chan struct{}
+	loopOnce        sync.Once
 }
 
 func (si *SnakeGameInstance) ID() string {
@@ -214,9 +206,9 @@ func (si *SnakeGameInstance) Join(player *Player) bool {
 	player.Slot = slot
 	si.game.Players[slot] = player
 
-	if si.persister != nil {
-		si.persister.SaveSnakePlayer(si.game.ID, player)
-		si.persister.SaveSnakeGame(si.game)
+	if si.queries != nil {
+		si.saveSnakePlayer(si.game.ID, player)
+		si.saveSnakeGame(si.game)
 	}
 
 	si.notify()
@@ -301,8 +293,8 @@ func (si *SnakeGameInstance) CreateRematch() *SnakeGameInstance {
 	}
 	si.game.RematchGameID = &newID
 
-	if si.persister != nil {
-		si.persister.SaveSnakeGame(si.game)
+	if si.queries != nil {
+		si.saveSnakeGame(si.game)
 	}
 	si.gameMu.Unlock()