Deploy fails for most app modes: app_mode → deploy subcommand mapping is incomplete

[dotNomad]

resolve_app_type maps a Connect app_mode to a posit connect deploy subcommand, but most app_mode names don't match.

$ posit connect deploy python-gradio
Error: No such command 'python-gradio'. Did you mean 'gradio'?

The authoritative app_mode list is AppModeFromString in
src/connect/worker/apptypes/apptypes.go:82, not the manifest docs
page.

Deploy subcommands come from AppModes._cli_aliases in rsconnect-python.

Works today

app_mode	subcommand
python-shiny	shiny
python-fastapi	fastapi
python-dash	dash
python-streamlit	streamlit
python-bokeh	bokeh
quarto-static	quarto
nodejs	nodejs — by accident; the names happen to match

Broken: the subcommand exists, we don't map it

app_mode	subcommand
python-api (Flask/WSGI)	api (or flask)
python-gradio	gradio
python-panel	panel
jupyter-static	notebook
jupyter-voila	voila
tensorflow-saved-model	tensorflow
static	html

No correct subcommand to map to

• shiny, rmd-shiny, rmd-static, api — R content; these already error
  today asking for a manifest.json
• quarto-shiny — silently deploys as quarto-static via posit connect deploy quarto; needs ... deploy manifest instead
• proxied — no CLI alias at all; not deployable from source

shiny and api are the sharp edge here: subcommands by those names do
exist, but they mean python-shiny and python-api (see below), so mapping
them straight through would deploy R content as Python.

Also

APP_MODE_TO_TYPE contains a python-flask key, but no such app_mode
exists — Connect reports Flask content as python-api. That entry never
fires, and Flask content fails.

api and shiny mean different things in the two namespaces: as app_modes
they are R Plumber and R Shiny, as CLI aliases they are python-api and
python-shiny.

Proposed fix

Fill in the missing modes, delete the dead python-flask key, and route
quarto-shiny and proxied to explicit errors.

Replace the fall-through with a clear error naming the supported modes, since
passing an unmapped mode through provably produces No such command.
Parametrize the tests over all 20 modes in AppModeFromString so a mode Connect
adds later fails loudly instead of falling through.

Docs discrepancy (separate, connect repo)

The manifest docs page lists jupyter and quarto, which
AppModeFromString rejects, and omits rmd-shiny, nodejs, and proxied.
Worth a docs issue; not in scope here.

Found while reviewing #75 — see Neal's comment.

[nealrichardson]

FTR quarto-shiny doesn't work at all, see #65 and the underlying rsconnect-python issue