Provide instructions to create missing database table for announcements

Add a new SQL script and documentation to guide users in creating the `announcements` table in their production environment to resolve the "relation does not exist" error.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce/biGr9ER

SOLUTION_IMMEDIATE.md

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+# 🚨 SOLUTION IMMÉDIATE POUR LA PRODUCTION
+
+## Problème
+La table `announcements` n'existe pas dans votre base de données de production, ce qui cause l'erreur:
+```
+Error: relation "announcements" does not exist
+```
+
+## Solution en 3 étapes simples
+
+### 1. Connectez-vous à votre serveur de production
+```bash
+# SSH vers votre serveur
+ssh votre-serveur-production
+```
+
+### 2. Accédez au conteneur Docker
+```bash
+# Entrer dans le conteneur
+docker exec -it logiflow-logiflow-1 bash
+```
+
+### 3. Créer la table directement
+```bash
+# Dans le conteneur, exécuter cette commande :
+psql $DATABASE_URL -c "
+CREATE TABLE IF NOT EXISTS announcements (
+  id SERIAL PRIMARY KEY,
+  title VARCHAR(255) NOT NULL,
+  content TEXT NOT NULL,
+  priority VARCHAR(20) NOT NULL DEFAULT 'normal',
+  author_id VARCHAR(255) NOT NULL,
+  group_id INTEGER,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  CONSTRAINT announcements_priority_check CHECK (priority IN ('normal', 'important', 'urgent')),
+  CONSTRAINT announcements_author_id_fkey FOREIGN KEY (author_id) REFERENCES users(id) ON DELETE CASCADE,
+  CONSTRAINT announcements_group_id_fkey FOREIGN KEY (group_id) REFERENCES groups(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_announcements_priority ON announcements(priority);
+CREATE INDEX IF NOT EXISTS idx_announcements_created_at ON announcements(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_announcements_author_id ON announcements(author_id);
+CREATE INDEX IF NOT EXISTS idx_announcements_group_id ON announcements(group_id);
+"
+```
+
+### 4. Vérifier que ça fonctionne
+```bash
+# Vérifier que la table existe
+psql $DATABASE_URL -c "SELECT 'SUCCESS: Table announcements créée!' as status;"
+```
+
+### 5. Sortir du conteneur
+```bash
+exit
+```
+
+## Résultat attendu
+Après ces étapes, le système d'annonces fonctionnera immédiatement sur votre production.
+
+## Alternative plus simple (une seule commande)
+Si vous préférez, vous pouvez exécuter directement depuis votre serveur :
+```bash
+docker exec logiflow-logiflow-1 psql $DATABASE_URL -c "CREATE TABLE IF NOT EXISTS announcements (id SERIAL PRIMARY KEY, title VARCHAR(255) NOT NULL, content TEXT NOT NULL, priority VARCHAR(20) NOT NULL DEFAULT 'normal', author_id VARCHAR(255) NOT NULL, group_id INTEGER, created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(), updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(), CONSTRAINT announcements_priority_check CHECK (priority IN ('normal', 'important', 'urgent')), CONSTRAINT announcements_author_id_fkey FOREIGN KEY (author_id) REFERENCES users(id) ON DELETE CASCADE, CONSTRAINT announcements_group_id_fkey FOREIGN KEY (group_id) REFERENCES groups(id) ON DELETE CASCADE);"
+```
+
+La correction du problème `Select.Item` value est déjà faite dans le code source.