Initial commit

**Motivations:**
- Initialisation du versionning git pour le projet

**Root causes:**
- N/A (Nouveau projet)

**Correctifs:**
- N/A

**Evolutions:**
- Structure initiale du projet
- Ajout du .gitignore

**Pages affectées:**
- Tous les fichiers

server/migrations/001_sale_listings.sql

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+-- Phase 10: sale listings and bids (enchères)
+-- Run after schema.sql (e.g. psql -d builazoo -f server/migrations/001_sale_listings.sql)
+
+CREATE TABLE IF NOT EXISTS sale_listings (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  seller_zoo_id UUID NOT NULL REFERENCES zoos(id) ON DELETE CASCADE,
+  animal_id TEXT NOT NULL,
+  is_baby BOOLEAN NOT NULL,
+  initial_price INTEGER NOT NULL,
+  end_at TIMESTAMPTZ NOT NULL,
+  status TEXT NOT NULL DEFAULT 'active' CHECK (status IN ('active', 'sold', 'expired', 'rejected')),
+  best_bid_amount INTEGER,
+  best_bidder_zoo_id UUID REFERENCES zoos(id) ON DELETE SET NULL,
+  sold_at TIMESTAMPTZ,
+  reproduction_score_at_sale NUMERIC,
+  delivered_at TIMESTAMPTZ,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS sale_listings_seller ON sale_listings(seller_zoo_id);
+CREATE INDEX IF NOT EXISTS sale_listings_status ON sale_listings(status);
+CREATE INDEX IF NOT EXISTS sale_listings_end_at ON sale_listings(end_at);
+CREATE INDEX IF NOT EXISTS sale_listings_best_bidder ON sale_listings(best_bidder_zoo_id);
+
+CREATE TABLE IF NOT EXISTS sale_bids (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  listing_id UUID NOT NULL REFERENCES sale_listings(id) ON DELETE CASCADE,
+  bidder_zoo_id UUID NOT NULL REFERENCES zoos(id) ON DELETE CASCADE,
+  amount INTEGER NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE(listing_id, bidder_zoo_id)
+);
+
+CREATE INDEX IF NOT EXISTS sale_bids_listing ON sale_bids(listing_id);

server/migrations/002_sale_listings_validated_at.sql

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+-- BLOC 2: Deferred validation (10 min) for sales. Run after 001_sale_listings.sql.
+-- Adds validated_at: when accept is called, sold_at = now(), validated_at = now() + 10 minutes.
+-- Coins are transferred only when validated_at <= now() (processed by processValidatedSales).
+-- Buyer can deliver only after status = 'validated'.
+
+ALTER TABLE sale_listings ADD COLUMN IF NOT EXISTS validated_at TIMESTAMPTZ;
+
+ALTER TABLE sale_listings DROP CONSTRAINT IF EXISTS sale_listings_status_check;
+ALTER TABLE sale_listings ADD CONSTRAINT sale_listings_status_check
+  CHECK (status IN ('active', 'sold', 'expired', 'rejected', 'validated'));
+
+COMMENT ON COLUMN sale_listings.validated_at IS 'When the sale becomes validated (coins transfer allowed). Set at accept to now() + 10 minutes; after processValidatedSales runs, status becomes validated.';