feat. rebuild service in Go

Rebuild the Gitea Codex review bot from the product contract with a Go HTTP service, durable SQL queue, typed Gitea client, isolated runner, and deployment updates.

Co-Authored-By: Claude <noreply@anthropic.com>

internal/store/store.go

@@ -0,0 +1,24 @@
+package store
+
+import (
+	"context"
+	"time"
+
+	"gitea-codex-bot/internal/domain"
+)
+
+type Store interface {
+	Migrate(context.Context) error
+	InsertWebhookEvent(context.Context, domain.WebhookEvent) (bool, error)
+	CooldownRemaining(context.Context, string, int, time.Duration) (int, error)
+	EnqueueJob(context.Context, domain.WebhookEvent, domain.ParsedCommand) (domain.Job, error)
+	ClaimNextJob(context.Context, time.Time, time.Duration, int) (*domain.Job, *domain.ReviewRun, error)
+	FinishJob(context.Context, int64, int64, bool, bool, *domain.ReviewResult, error) error
+	LatestFailedJob(context.Context) (*domain.Job, error)
+	LatestJob(context.Context) (*domain.Job, error)
+	LatestSuccessfulReview(context.Context, string, int) (*domain.Job, error)
+	PendingCount(context.Context, string, int) (int, error)
+	UpsertBotComment(context.Context, string, int, string, int64, string) error
+	BotCommentID(context.Context, string, int, string) (int64, error)
+	Close() error
+}