feat(theme-selector): generated all-package inventory (tier-3 phase 6)

I added the hybrid inventory. build-inventory.el, loaded into a running Emacs, queries every installed package's faces grouped by the package that defines them and writes package-inventory.json. generate.py embeds that file and merges each package into the app dropdown as an editable generic app, leaving the bespoke org, magit, and elfeed untouched.

The dropdown now reaches 40 apps: the three bespoke plus 37 inventory packages (643 faces), so any installed package can be themed against the palette with the generic preview. The inventory is a committed data artifact refreshed by reloading the .el, never browser-side discovery, matching the spec's hybrid-and-split decision.

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