Refactor API and enhance Angular integration

- Removed `ciTargetName` from `nx.json`.
- Updated `package.json` to include new dependencies: `@types/seedrandom`, `fast-check`, `happy-dom`, and `@nestjs/schedule`.
- Modified `pnpm-lock.yaml` to reflect the addition of new packages and their versions.
- Improved project documentation in `PROJECT_CONTEXT.md` to clarify the use of Zod schemas and Angular framework decisions.
- Introduced new Angular components and patterns in the `.agents/skills/frontend-angular` directory, including examples and reference materials for Angular 21+ features.

libs/api-interfaces/src/index.ts

@@ -2,3 +2,5 @@ export * from './lib/perk';
 export * from './lib/survivor';
 export * from './lib/mission';
 export * from './lib/encounter';
+export * from './lib/encounter-definition';
+export * from './lib/mission-state';

libs/api-interfaces/src/lib/encounter-definition.ts

@@ -0,0 +1,8 @@
+import { z } from 'zod';
+
+export const EncounterDefinitionSchema = z.object({
+  key: z.string().min(1),
+  baseProbability: z.number().min(0).max(1),
+  tags: z.array(z.string()),
+});
+export type EncounterDefinition = z.infer<typeof EncounterDefinitionSchema>;

libs/api-interfaces/src/lib/mission-state.ts

@@ -0,0 +1,23 @@
+import { z } from 'zod';
+import { EncounterResultSchema } from './encounter';
+import { MissionSchema } from './mission';
+import { SurvivorSchema } from './survivor';
+
+export const MissionStateResponseSchema = z
+  .object({
+    mission: MissionSchema,
+    survivors: z.array(SurvivorSchema),
+    recentLog: z.array(EncounterResultSchema).max(20),
+  })
+  .nullable();
+export type MissionStateResponse = z.infer<typeof MissionStateResponseSchema>;
+
+export const StartMissionRequestSchema = z.object({
+  difficulty: z.number().int().min(1).max(3),
+});
+export type StartMissionRequest = z.infer<typeof StartMissionRequestSchema>;
+
+export const ChoosePerkRequestSchema = z.object({
+  perkKey: z.string().min(1),
+});
+export type ChoosePerkRequest = z.infer<typeof ChoosePerkRequestSchema>;