feat(access): add governed session management

src/govoplan_access/backend/api/v1/admin_schemas.py

@@ -37,6 +37,33 @@ class AdminOverviewResponse(BaseModel):
     capabilities: list[str] = Field(default_factory=list)
 
 
+class AdminSessionItem(BaseModel):
+    id: str
+    tenant_id: str
+    current: bool
+    status: Literal["active", "expired", "revoked"]
+    created_at: datetime
+    last_seen_at: datetime | None = None
+    expires_at: datetime
+    revoked_at: datetime | None = None
+    client: str | None = None
+
+
+class AdminSessionListResponse(BaseModel):
+    sessions: list[AdminSessionItem] = Field(default_factory=list)
+
+
+class AdminSessionRevocationRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    current_password: str = Field(min_length=1, max_length=1024)
+
+
+class AdminSessionRevocationResponse(BaseModel):
+    session: AdminSessionItem
+    revoked: bool
+
+
 class TenantAdminItem(BaseModel):
     id: str
     slug: str = Field(min_length=1, max_length=100)