feat: sync source-backed OSM facility entrances

infrastructure/sql/05_poi_gates_clustering.sql

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+-- وظيفة الملف: استعلام أو تغيير قاعدة بيانات يخص 05 poi gates clustering؛ راجع ترتيب التنفيذ قبل تطبيقه.
+-- 1. Create the place_gates table
+CREATE TABLE IF NOT EXISTS place_gates (
+    id SERIAL PRIMARY KEY,
+    place_id VARCHAR(255) NOT NULL, -- references unified_search_index.id
+    gate_name_ar VARCHAR(255) NOT NULL,
+    gate_name_en VARCHAR(255),
+    latitude NUMERIC(10, 7) NOT NULL,
+    longitude NUMERIC(10, 7) NOT NULL,
+    is_main_gate BOOLEAN DEFAULT false,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_place_gates_place_id ON place_gates(place_id);
+
+-- No gate seed rows belong here: service doors must come from an explicit,
+-- source-backed entrance node. See scripts/sync_osm_place_gates.py.
+
+-- Prepare schema for future K-Means Clustering (Sero Trip Drop-offs)
+CREATE TABLE IF NOT EXISTS sero_dropoffs (
+    id SERIAL PRIMARY KEY,
+    place_id VARCHAR(255) NOT NULL,
+    latitude NUMERIC(10, 7) NOT NULL,
+    longitude NUMERIC(10, 7) NOT NULL,
+    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_sero_dropoffs_place_id ON sero_dropoffs(place_id);