Add directory skeleton and CLI entry point with Cobra

- Create internal/{app,config,engine,divert,socks5,bypass,checker,service,tray,procscan,updater} with placeholder doc.go per package.
- Add .gitkeep stubs for internal/frontend, third_party/{windivert,icons}, installer/, .forgejo/workflows/, docs/.
- Implement cmd/drover/main.go: Cobra root with Version/Commit/BuildDate ldflags, --config global flag, and stub subcommands (check, update --check-only, service install/uninstall/start/stop).
- Add github.com/spf13/cobra v1.10.2 dependency.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/app/doc.go

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+// Package app wires the Wails application (Go ↔ JS bindings).
+package app

internal/bypass/doc.go

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+// Package bypass implements DPI bypass via fake QUIC injection.
+package bypass

internal/checker/doc.go

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+// Package checker runs the 7-step proxy diagnostic.
+package checker

internal/config/doc.go

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+// Package config loads and validates the TOML configuration.
+package config

internal/divert/doc.go

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+// Package divert wraps WinDivert for kernel-level packet capture.
+package divert

internal/engine/doc.go

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+// Package engine orchestrates the packet processing pipeline.
+package engine

internal/procscan/doc.go

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+// Package procscan resolves process IDs via Toolhelp32.
+package procscan

internal/service/doc.go

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+// Package service installs the Windows service and exposes the IPC named pipe.
+package service

internal/socks5/doc.go

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+// Package socks5 implements a SOCKS5 client (CONNECT + UDP ASSOCIATE, RFC 1928 + 1929).
+package socks5

internal/tray/doc.go

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+// Package tray manages the system tray icon.
+package tray

internal/updater/doc.go

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+// Package updater performs self-update via the Forgejo Releases API.
+package updater