repl: Improve value syntax highlighting

Adopt a richer color palette and emit formatted-text fragments
instead of raw ANSI, letting prompt_toolkit downsample them to the
terminal's color depth.

repl: Relocate all agent bundle modules

The agent bundle now ships multiple modules, but only the entrypoint
was moved under /frida/repl, so its relative imports failed to resolve.

repl: Render evaluated values richly

Encode each result into a bounded tagged tree in the agent so
serializing cyclic or huge objects can never hang, then pretty-print
it host-side with syntax highlighting, depth and breadth caps, and a
hexdump for binary data.

deps: Require Frida >= 17.10.0

Bump frida-objc-bridge to 8.0.6

itracer: Bump frida-itrace dependency

deps: Require Frida >= 17.9.0

Needed for device option support.

stracer: Add help popup via '?' keybinding

Lists all keyboard shortcuts in a centered floating pane. Press '?' or
Escape to dismiss.

Require Frida >= 17.8.0

For SyscallTracer with the new stable protocol.

Require Frida >= 17.7.3

For SyscallTracer and Python binding fixes.