chore: rename Go module path gitea.d-ma.be → git.d-ma.be

Infra ADR-0004 renamed the Gitea host. Bulk replace across go.mod and
all .go import paths. Build and tests pass unchanged.

Closes #20

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dt6aHEDWRjkK14Voi6HnGh

internal/usecase/engine.go

@@ -14,8 +14,8 @@ import (
 	"fmt"
 	"sync"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/ports"
 )
 
 // ErrNotImplemented marks scaffold methods awaiting implementation.

internal/usecase/engine_transcript_test.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"testing"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // These tests pin the ADR-021 read-stored-first behaviour at the engine core: