refactor: add session and environment relationships to scenario run

- add sessionId optional column to ScenarioRunEntity
- add ManyToOne relationship to EnvironmentEntity (with eager loading)
- add ManyToOne relationship to SessionEntity (optional)
- update ScenarioRun client types to include session and environment data
- add environment name and session link to RunDetailPage
- update UI to display save session, environment, and session info

server/src/mcp/mcp.service.ts

@@ -703,7 +703,7 @@ export class McpService {
         inputSchema: {
           id: z.uuid().describe("Scenario ID to run"),
           environmentId: z.uuid().describe("Environment ID to run the scenario in"),
-          saveSession: z.boolean().optional().describe("Save session for explore mode after run completes"),
+          saveSession: z.boolean().optional().describe("Save session after run completes"),
         },
       },
       async ({ id, environmentId, saveSession }) => {