Iterating the final install step no longer needs a delete + re-load of the
.cap:
- `POST /api/ram-install-app` runs INSTALL [for install] (`mode: "install"`,
P1 0x0C/0x04 by make_selectable) or INSTALL [for make selectable]
(`mode: "make_selectable"`, GP 11.5.2.3.3 Table 11-44) for an already
loaded package. The APDU builders are shared with `_cap_apdu_sequence`
(`_cap_install_apdu`, `_cap_make_selectable_apdu` - one builder, no drift)
and the per-step send/PoR/counter logic is the extracted shared
`_ram_send_gp_apdu` (used by /api/ram-install too).
- PWA: the RAM op selector gains "INSTALL [for install] (loaded package)"
and "INSTALL [for make selectable]" with Load File / Module / Instance AID
inputs (instance defaults to the module AID); the result renders through
the shared `ramShowInstallResult` and `final_cntr` keeps the preset in
sync.
- Explore: an **Install** button on a package's module AIDs that have no
instance yet, and a **Make selectable** button on INSTALLED (0x03)
instances - both switch the op and pre-fill the AIDs.
- tests: the install APDU pinned to the live no-STK packet and to the
sequence tail, the make-selectable APDU, ramHasInstance, the Explore
buttons and the op wiring; docs/api.md updated.
650 frontend / 498 Python green; version 3.6.18; sw simple-v291.