Remove Programs tab and all supporting code

The Programs feature is superseded by Shows, which provides a more
flexible model with schedule slots. This commit removes all Programs
code across frontend and backend:

Frontend:
- Delete admin-program-form component (ts/html/scss)
- Delete program.service.ts and program.ts interface
- Remove Programs tab, form modal, and all CRUD logic from admin
  component (ts + html)

Backend:
- Delete programs API router
- Remove Program ORM model and ProgramCreate/Update/Response schemas
- Remove programs router registration from main.py
- Remove Program from seed data, seed helpers, and truncate/reset

src/app/services/program.service.ts

@@ -1,37 +0,0 @@
-import { Injectable, inject } from '@angular/core';
-import { HttpClient, HttpParams } from '@angular/common/http';
-import { Observable } from 'rxjs';
-
-import { Program } from '../interfaces/program';
-import { getAppConfig } from './app-config.service';
-
-@Injectable({
-  providedIn: 'root',
-})
-export class ProgramService {
-  private http = inject(HttpClient);
-  private baseUrl = `${getAppConfig().apiBaseUrl}/api/programs`;
-
-  /** Fetch all programs, optionally filtered by day_of_week (1=Mon … 7=Sun). */
-  getPrograms(day?: number): Observable<Program[]> {
-    let params = new HttpParams();
-    if (day !== undefined) params = params.set('day', String(day));
-    return this.http.get<Program[]>(this.baseUrl, { params });
-  }
-
-  getProgram(id: number): Observable<Program> {
-    return this.http.get<Program>(`${this.baseUrl}/${id}`);
-  }
-
-  createProgram(payload: Omit<Program, 'id'>): Observable<Program> {
-    return this.http.post<Program>(this.baseUrl, payload);
-  }
-
-  updateProgram(id: number, payload: Partial<Program>): Observable<Program> {
-    return this.http.put<Program>(`${this.baseUrl}/${id}`, payload);
-  }
-
-  deleteProgram(id: number): Observable<void> {
-    return this.http.delete<void>(`${this.baseUrl}/${id}`);
-  }
-}