refactor: reorganize docs folder structure and update P2P plan

web/supabase/migrations/20241211140000_add_ad_type_column.sql

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+-- Add ad_type column to p2p_fiat_offers
+-- This distinguishes between buy and sell offers
+
+ALTER TABLE public.p2p_fiat_offers
+ADD COLUMN IF NOT EXISTS ad_type TEXT NOT NULL DEFAULT 'sell'
+CHECK (ad_type IN ('buy', 'sell'));
+
+-- Add index for filtering by ad_type
+CREATE INDEX IF NOT EXISTS idx_p2p_offers_ad_type ON public.p2p_fiat_offers(ad_type);
+
+-- Update existing offers to be 'sell' type (default)
+UPDATE public.p2p_fiat_offers SET ad_type = 'sell' WHERE ad_type IS NULL;
+
+COMMENT ON COLUMN public.p2p_fiat_offers.ad_type IS 'Type of offer: buy (user wants to buy crypto) or sell (user wants to sell crypto)';