feat: ship end-to-end interior design MVP

services/api/tests/test_design_pipeline.py

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+import base64
+
+import pytest
+
+from app.domain.models import DesignBrief, StructureAnalysis
+from app.services.design_pipeline import (
+    create_style_directions,
+    fallback_structure,
+    generated_image_bytes,
+    resolve_model_instance,
+)
+
+
+@pytest.mark.asyncio
+async def test_manual_model_routing_uses_selected_pool_item() -> None:
+    values = {
+        "image_routing_mode": "manual",
+        "image_model_id": "image-2",
+        "model_pool": [
+            {
+                "id": "image-2",
+                "enabled": True,
+                "capabilities": ["image_generation"],
+            }
+        ],
+    }
+
+    assert await resolve_model_instance(values, "image") == "image-2"
+
+
+@pytest.mark.asyncio
+async def test_generated_image_bytes_accepts_verified_inline_image() -> None:
+    content = b"\x89PNG\r\n\x1a\n" + b"x" * 2048
+    payload = {
+        "data": [
+            {
+                "url": "data:image/png;base64,"
+                + base64.b64encode(content).decode("ascii")
+            }
+        ]
+    }
+
+    image, content_type = await generated_image_bytes(payload)
+
+    assert image == content
+    assert content_type == "image/png"
+
+
+@pytest.mark.asyncio
+async def test_style_direction_generation_has_non_blocking_fallback() -> None:
+    brief = DesignBrief(preferred_styles=["现代简约"], disliked_elements=["复杂吊顶"])
+
+    directions, model_name = await create_style_directions({}, brief, StructureAnalysis())
+
+    assert len(directions) == 3
+    assert all(direction.prompt for direction in directions)
+    assert "降级" in model_name
+
+
+def test_spatial_fallback_remains_editable() -> None:
+    analysis = fallback_structure("provider unavailable")
+
+    assert analysis.degraded is True
+    assert analysis.status == "needs_review"
+    assert len(analysis.rooms) >= 6
+    assert analysis.risks == ["provider unavailable"]