docs: flèches coudées nettes dans le schéma

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/architecture.excalidraw

@@ -1806,9 +1806,7 @@
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       "groupIds": [],
       "frameId": null,
-      "roundness": {
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       "version": 1,
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@@ -1845,7 +1843,7 @@
     {
       "id": "text-52",
       "type": "text",
-      "x": 330,
+      "x": 300,
       "y": 600,
       "width": 82.5,
       "height": 37.5,
@@ -1978,9 +1976,7 @@
       "opacity": 100,
       "groupIds": [],
       "frameId": null,
-      "roundness": {
-        "type": 2
-      },
+      "roundness": null,
       "seed": 356416555,
       "version": 1,
       "versionNonce": 756849393,