Add shares-plus module: recursive share permission enumeration

[mHijuxS]

Description

Adds a new shares-plus SMB module that recursively enumerates share permissions on a per-directory basis. Unlike spider_plus (which focuses on file inventory and download), this module maps READ/WRITE access at every directory level to identify ACL boundaries and writable drop paths.

Key features:

• Recursive directory crawling with configurable DEPTH limit
• Per-directory write checks (creates + deletes a temp directory)
• Delta mode: only highlights directories where permissions differ from their parent
• File listing with human-readable sizes
• Summary of all writable subdirectories at the end
• Configurable share/folder exclusions
• Auto-reconnect on connection drops

This PR was created with the assistance of AI (Claude Code - used for planning, implementing, linting, e2e test generation, and PR readiness).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Deprecation of feature or functionality
• This change requires a documentation update
• This requires a third party update (such as Impacket, Dploot, lsassy, etc)
• This PR was created with the assistance of AI (list what type of assistance, tool(s)/model(s) in the description)

Setup guide for the review

• Any SMB target with accessible shares (tested against Windows Server 2019 Build 17763 DC with multiple shares and nested directories with varying ACLs)
• No additional software or configuration needed beyond a standard NetExec install

Usage examples:
nxc smb -u -p -M shares-plus
nxc smb -u -p -M shares-plus -o DEPTH=5 DELTA=True WRITE_CHECK=True FILES=False

Module options:

Option	Default	Description
DEPTH	3	Max recursion depth (0 = unlimited)
EXCLUDE	print$,ipc$	Comma-separated shares/folders to skip
DELTA	True	Only show dirs where perms differ from parent
WRITE_CHECK	True	Test write permission per directory
FILES	True	Show files in each directory

Screenshots

Checklist:

• I have ran Ruff against my changes (poetry: poetry run ruff check ., use --fix to automatically fix what it can)
• I have added or updated the tests/e2e_commands.txt file if necessary (new modules or features are required to be added to the e2e tests)
• If reliant on changes of third party dependencies, such as Impacket, dploot, lsassy, etc, I have linked the relevant PRs in those projects
• I have linked relevant sources that describes the added technique (blog posts, documentation, etc)
• I have performed a self-review of my own code (not an AI review)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (PR here: https://github.com/Pennyw0rth/NetExec-Wiki)

[NeffIsBack]

Closing as per our AI policy: https://github.com/Pennyw0rth/NetExec/blob/main/AI_POLICY.md

Also duplicate to #1188, see #1188 (comment)