feat(#131): fiches parent/AM éditable, placement AM↔enfant, statuts garde/sans_garde

Squash merge develop → master.

- Fiche parent éditable (co-parent, PATCH fiche, GET /parents)
- Fiche AM 3 onglets (PATCH fiche, rattacher/détacher enfants)
- Table enfants_assistantes_maternelles + enum garde/sans_garde
- Migration SQL + BDD.sql canonique
- Correctifs recette : @Get() parents, DTO fiche AM, fix NIR

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/widgets/common/auth_network_image.dart

@@ -13,6 +13,7 @@ class AuthNetworkImage extends StatefulWidget {
     this.width,
     this.height,
     this.fit = BoxFit.cover,
+    this.alignment = Alignment.center,
     this.loadingBuilder,
     this.errorBuilder,
   });
@@ -21,6 +22,7 @@ class AuthNetworkImage extends StatefulWidget {
   final double? width;
   final double? height;
   final BoxFit fit;
+  final AlignmentGeometry alignment;
   final ImageLoadingBuilder? loadingBuilder;
   final ImageErrorWidgetBuilder? errorBuilder;
 
@@ -75,6 +77,7 @@ class _AuthNetworkImageState extends State<AuthNetworkImage> {
         width: widget.width,
         height: widget.height,
         fit: widget.fit,
+        alignment: widget.alignment,
         loadingBuilder: widget.loadingBuilder,
         errorBuilder: err,
       );
@@ -105,6 +108,7 @@ class _AuthNetworkImageState extends State<AuthNetworkImage> {
           width: widget.width,
           height: widget.height,
           fit: widget.fit,
+          alignment: widget.alignment,
           headers: headers,
           loadingBuilder: widget.loadingBuilder,
           errorBuilder: err,