Support pc init . to scaffold a project in place

[markbackman]

Summary

Adds an optional positional TARGET path to pc init. Passing a path — e.g. pc init . — scaffolds the project contents directly into that directory instead of nesting them under a <project_name>/ subfolder (the vite/django convention: npm create vite@latest ., django-admin startproject name .).

This is motivated by the upcoming Pipecat agentic coding loop: a user creates a directory containing CLAUDE.md guidance, the agent runs pc init, and the project should land in that directory rather than nested one level down (which would otherwise force the agent to mv/rmdir files around — fragile with hidden files and stray artifacts).

Non-breaking: omitting the positional argument keeps the exact current behavior (<-o or cwd>/<name>/).

Behavior

Invocation	Result
pc init	Unchanged — <-o or cwd>/<name>/ subfolder
pc init .	Scaffold into the current dir; name defaults to the dir basename
pc init ./foo	Scaffold directly into ./foo (created if missing)
pc init quickstart [-o DIR]	Unchanged — runs quickstart defaults

• The positional TARGET is the exact destination; -o/--output keeps its legacy "parent dir + name subfolder" meaning. Passing both is an error.
• Project name when TARGET is given: --name if provided, else derived from the target directory's basename. So --name is optional in this mode.

Implementation notes

• init converted from a Typer group to a plain command. A positional argument on a Click group can't be followed by options (parsing stops at the first positional), which would break pc init . --bot-type web .... As a plain command, interspersed options work. The quickstart token is dispatched from within init_command to preserve pc init quickstart [-o DIR].
• ProjectGenerator.generate(..., in_place=True) writes straight into the target, guards against clobbering an existing project (aborts if a server/ dir is already present), and print_next_steps omits the now-irrelevant cd <name> step. Shared file-writing logic extracted into _write_project_files.

Testing

• uv run pytest tests/ → 445 passing.
• New tests/test_init_in_place.py: in-place writes, name derivation, CLAUDE.md preservation, conflict abort, target/-o mutual exclusion, and non-breaking regressions (nested layout + quickstart). Plus generator-level in_place unit tests.
• Manual: pc init . into a dir holding CLAUDE.md → flat layout (server/, README.md, .gitignore), CLAUDE.md untouched, name derived from the folder.

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