Switch lamps to internal IDs; EAN becomes optional metadata

Directories rename from bare EANs to L0001..L0010 (measurement order).
metrics.json gains an ean field, and a rated block with advertised
values (flux, CCT, power, lifetime) where already documented, so the
site can show advertised-vs-measured deltas. One EAN can now cover
several lamp versions (variant field) and unbranded lamps need no
barcode.

lamps/L0003/spd.csv

@@ -0,0 +1,351 @@
+wavelength_nm,value
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