Replace infrastructure costs with actual domain invoice data

Start ledger January 2025. Record coulomb.social (3.75 EUR/mo) and
coulomb.pro (3.00 EUR/mo) as per-domain expense rows. Remove Bubble and
placeholder overhead. Add infrastructure reference catalogs; virtual server
records pending invoice data.

projects/coulomb-pricing/data/membership.json

@@ -12,5 +12,5 @@
       "note": "Sole paying member; payments from November 2025"
     }
   ],
-  "note": "Platform costs run from March 2025; member payments from November 2025."
+  "note": "Infrastructure costs run from January 2025; member payments from November 2025."
 }