feat(schema): add FIRMS adapter and CENTRAL_FIRE stream

Migration 005 seeds:
- config.adapters row for firms (300s cadence, PNW bbox)
- config.streams row for CENTRAL_FIRE (7d retention)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sql/migrations/005_add_firms_adapter.sql

@@ -0,0 +1,27 @@
+-- Migration: 005_add_firms_adapter
+-- Seeds FIRMS adapter configuration and CENTRAL_FIRE stream.
+
+-- Seed FIRMS adapter row
+INSERT INTO config.adapters (name, enabled, cadence_s, settings)
+VALUES (
+    'firms',
+    true,
+    300,
+    jsonb_build_object(
+        'region', jsonb_build_object(
+            'north', 49.5,
+            'south', 31.0,
+            'east', -102.0,
+            'west', -124.5
+        ),
+        'api_key_alias', 'firms',
+        'satellites', jsonb_build_array(
+            'VIIRS_SNPP_NRT',
+            'VIIRS_NOAA20_NRT'
+        )
+    )
+);
+
+-- Seed CENTRAL_FIRE stream row
+INSERT INTO config.streams (name, max_age_s, max_bytes)
+VALUES ('CENTRAL_FIRE', 604800, 1073741824);