Add app config schema and shared models

src/app/config/AppConfig.ts

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+import { z } from 'zod';
+import { loadEnv } from '../../core/config/env';
+
+const boolFromEnv = (defaultValue: 'true' | 'false') =>
+  z
+    .string()
+    .optional()
+    .default(defaultValue)
+    .transform((v) => v === 'true');
+
+export const AppConfigSchema = z.object({
+  JELLYFIN_URL: z.string(),
+  JELLYFIN_API_KEY: z.string(),
+  JELLYFIN_USER_ID: z.string(),
+  TMDB_API_KEY: z.string(),
+
+  LLM_ENABLED: boolFromEnv('false'),
+  LLM_BASE_URL: z.string().default('http://localhost:11434/v1'),
+  LLM_API_KEY: z.string().optional().default(''),
+  LLM_MODEL: z.string().default('llama3'),
+
+  RADARR_ENABLED: boolFromEnv('false'),
+  RADARR_URL: z.string().optional().default(''),
+  RADARR_API_KEY: z.string().optional().default(''),
+  RADARR_QUALITY_PROFILE_ID: z.coerce.number().default(1),
+  RADARR_ROOT_FOLDER: z.string().default('/movies'),
+
+  CRON_ENABLED: boolFromEnv('false'),
+  CRON_SCHEDULE: z.string().default('0 3 * * *'),
+
+  API_ENABLED: z
+    .string()
+    .optional()
+    .default('true')
+    .transform((v) => v !== 'false'),
+  API_PORT: z.coerce.number().default(8080),
+  SECRET_KEY: z.string().optional().default(''),
+
+  RECOMMEND_COUNT: z.coerce.number().default(10),
+  RECOMMEND_MAX_RETRY: z.coerce.number().default(3),
+  MIN_RATED_MOVIES: z.coerce.number().default(5),
+
+  LANGFUSE_PUBLIC_KEY: z.string(),
+  LANGFUSE_SECRET_KEY: z.string(),
+  LANGFUSE_BASE_URL: z.string(),
+  LANGFUSE_PROMPT_CACHE_ENABLED: boolFromEnv('true'),
+});
+
+export type AppConfig = z.infer<typeof AppConfigSchema>;
+
+export function loadAppConfig(source: NodeJS.ProcessEnv = process.env): AppConfig {
+  return loadEnv(AppConfigSchema, source);
+}

src/app/models.ts

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+export interface Movie {
+  name: string;
+  year: number;
+  imdbId: string;
+  tmdbId: string;
+  genres: string[];
+  communityRating: number;
+  isFavorite: boolean;
+  playCount: number;
+}
+
+export interface TMDbMovie {
+  id: number;
+  title: string;
+  year: number;
+}
+
+export interface MovieSuggestion {
+  title: string;
+  year: number;
+  reason: string;
+}
+
+export interface Recommendation {
+  title: string;
+  year: number;
+  tmdbId: number;
+  reason: string;
+}