BruhMount Milestone Checkpoint #530 (v2.1.0-enhanced)

🚀 BruhMount Milestone Checkpoint (#530)

Trigger: Accumulated 24 commits since checkpoint-506-a4196cf
Version: v2.1.0-enhanced
Commit: abc6cbf

📋 Changes Compiled Since Last Checkpoint:

• webui: correct Russian translations (a159c0c)
• kernel: unify directory operation proxies (31ae781)
• kernel: separate path topology from UID rules (a417f67)
• kernel: reject unresolved backing paths (1a470a7)
• kernel: fix batched rule parsing (49294e8)
• kernel: fix directory entry inode numbers (7ca2c8a)
• kernel: degrade parent rule to virtual dir if it have active children (5fac312)
• kernel: prevent double-free race in lockless dir_node eviction (953911f)
• kernel: free the entire rule if !dir_node (2a9fe6b)
• kernel: return -ESTALE if igrab() fails in nomount_resolve_rule_dentry (473947c)
• kernel: don't put S_PRIVATE flag in real path inode (8c3efcd)
• kernel: remove __nomount_alloc_dir_node helper (f66d44a)
• webui: split clear actions into rules, UIDs, and all (0be4967)
• kernel: restore ops on eviction and skip double hooking (047f59f)
• kernel: replace busy-wait with optimistic inode allocation (074a8ad)
• kernel: proxy xattr __get handler to prevent overlayfs bypass (maxsteeel#86) (44d8b23)
• userspace: improve usage / help output (71ff9c4)
• userspace: move argument handling to a helper function outside of c_main (4b25def)
• module: limit xargs batch size to avoid ARG_MAX truncation (74850fc)
• chore(release): update update.json for version 21509 [skip ci] (8b50808)
• webui: update Vietnamese i18n translation (maxsteeel#85) (c5fad9d)
• chore(release): update update.json for version 21506 [skip ci] (b46df33)

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