Revert startup_command shell-command injection, restore send-keys (#384)

Fix startup regressions from #372 (#378)

Fix tmuxinator attach issue

tmuxinator start auto-attached when sesh invoked it, then
SwitchOrAttach ran a second attach that failed once the user killed
the session — surfacing as "Failed to attach to tmux session: exit
status 1". Pass --no-attach so tmuxinator only creates the session,
and --name=<project> so the tmux session name matches what sesh
knows about (tmuxinator list returns the file name, but yml `name:`
field can override the tmux session name). Propagate the error from
Start which was previously discarded.

Fix deps for window and pane features

🌐 i18n(README): Add the simplified Chinese version of README (#330)

* 🌐 i18n(README): Add the simplified Chinese version of README

* 📝 docs(README): Fix spelling errors and style inconsistencies in README

Fix man generator

Add man page generation to build and release pipeline (#341)

Wire the hidden `sesh man` subcommand (provided by fang/mango-cobra)
into the justfile, goreleaser hooks, archives, brew formula, and AUR
package so man pages are built and distributed automatically.

Create cache layer

Add --config/-C global flag for custom config path (#325)

* Add --config/-C global flag for custom config file path

Allow users to specify a custom config file path via --config/-C flag,
enabling use cases like NixOS wrappers, multiple contexts (work/private),
and testing with different configurations.

The flag is pre-parsed from os.Args before the DI graph is constructed,
keeping the existing eager initialization architecture intact.

* Add README instructions for custom config path

* Clean up config flag to work properly

* Refactor DI to lazy construction for --config flag

Replace eager DI in NewRootCommand with lazy construction in each
subcommand's RunE. This eliminates the extractConfigFlag hack in
main.go, makes --config/-C a normal cobra PersistentFlag, and
returns config errors cleanly instead of panicking.

Add git bare root namer (#319)

* Add git bare root namer

Detects a bare clone's worktree dir to make root more contextual

* Add tests and properly handle .git and .bare