fix(#297): Implement actual query processing for federation

Added query processing to route federation queries to domain services:
- Created query parser to extract intent and parameters from query strings
- Route queries to TasksService, EventsService, and ProjectsService
- Return actual data instead of placeholder responses
- Added workspace context validation

Implemented query types:
- Tasks: "get tasks", "show tasks", etc.
- Events: "get events", "upcoming events", etc.
- Projects: "get projects", "show projects", etc.

Added 5 new tests for query processing (20 tests total, all passing):
- Process tasks/events/projects queries
- Handle unknown query types
- Enforce workspace context requirements

Updated FederationModule to import TasksModule, EventsModule, ProjectsModule.

Fixes #297

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/api/src/federation/federation.module.ts

@@ -18,14 +18,21 @@ import { SignatureService } from "./signature.service";
 import { ConnectionService } from "./connection.service";
 import { OIDCService } from "./oidc.service";
 import { CommandService } from "./command.service";
+import { QueryService } from "./query.service";
 import { FederationAgentService } from "./federation-agent.service";
 import { PrismaModule } from "../prisma/prisma.module";
+import { TasksModule } from "../tasks/tasks.module";
+import { EventsModule } from "../events/events.module";
+import { ProjectsModule } from "../projects/projects.module";
 import { RedisProvider } from "../common/providers/redis.provider";
 
 @Module({
   imports: [
     ConfigModule,
     PrismaModule,
+    TasksModule,
+    EventsModule,
+    ProjectsModule,
     HttpModule.register({
       timeout: 10000,
       maxRedirects: 5,
@@ -61,6 +68,7 @@ import { RedisProvider } from "../common/providers/redis.provider";
     ConnectionService,
     OIDCService,
     CommandService,
+    QueryService,
     FederationAgentService,
   ],
   exports: [
@@ -71,6 +79,7 @@ import { RedisProvider } from "../common/providers/redis.provider";
     ConnectionService,
     OIDCService,
     CommandService,
+    QueryService,
     FederationAgentService,
   ],
 })