feat: Phase 3 - CRUD core for Techniques, Tests and Evidence (T-014 to T-017)

- Add Pydantic schemas for Technique, Test and Evidence
- Add CRUD endpoints for Techniques (list with filters, detail, create, update, review)
- Add CRUD endpoints for Tests (create, detail, update, validate, reject)
- Add evidence upload with SHA-256 integrity and presigned download URLs
- Add MinIO/S3 storage client with bucket auto-creation on startup
- Add status_service to recalculate technique coverage from test results
- Add require_any_role RBAC dependency for multi-role authorization
- Update README with API endpoints reference and project structure

backend/app/schemas/test.py

@@ -0,0 +1,67 @@
+"""Pydantic schemas for Test endpoints."""
+
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict
+
+from app.models.enums import TestResult, TestState
+
+
+# ── Create ──────────────────────────────────────────────────────────
+
+class TestCreate(BaseModel):
+    """Payload for creating a new test."""
+
+    technique_id: uuid.UUID
+    name: str
+    description: str | None = None
+    platform: str | None = None
+    procedure_text: str | None = None
+    tool_used: str | None = None
+
+
+# ── Update ──────────────────────────────────────────────────────────
+
+class TestUpdate(BaseModel):
+    """Payload for partially updating an existing test.
+    Every field is optional so callers send only what changed."""
+
+    name: str | None = None
+    description: str | None = None
+    platform: str | None = None
+    procedure_text: str | None = None
+    tool_used: str | None = None
+    result: TestResult | None = None
+
+
+# ── Read (full) ─────────────────────────────────────────────────────
+
+class TestOut(BaseModel):
+    """Complete representation returned by the API."""
+
+    id: uuid.UUID
+    technique_id: uuid.UUID
+    name: str
+    description: str | None = None
+    platform: str | None = None
+    procedure_text: str | None = None
+    tool_used: str | None = None
+    execution_date: datetime | None = None
+    created_by: uuid.UUID | None = None
+    result: TestResult | None = None
+    state: TestState = TestState.draft
+    validated_by: uuid.UUID | None = None
+    validated_at: datetime | None = None
+    created_at: datetime | None = None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+# ── Validate ────────────────────────────────────────────────────────
+
+class TestValidate(BaseModel):
+    """Payload sent by a reviewer to validate / reject a test."""
+
+    result: TestResult
+    comments: str | None = None