Premiere verison route admin operationnelle

backend/sql/matches.sql

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+-- Ensure basic matches table exists
+CREATE TABLE IF NOT EXISTS matches (
+  id SERIAL PRIMARY KEY,
+  tournament_id INT NOT NULL REFERENCES tournaments(id) ON DELETE CASCADE,
+  player_a_id INT REFERENCES participants(id),
+  player_b_id INT REFERENCES participants(id),
+  court TEXT,
+  start_time TIMESTAMP NULL,
+  score_a INT DEFAULT 0,
+  score_b INT DEFAULT 0,
+  finished BOOLEAN DEFAULT FALSE,
+  created_at TIMESTAMP DEFAULT now()
+);