refactor(fuse): generate mount CLI overrides from FuseConf (#1619)

[lzjqsdd]

Summary

Fourth PR of the stacked series for #1619 (4/7). Generates the curvine-fuse mount CLI overrides from FuseConf via the existing ClientCliArgs derive (opt-in mode), replacing ~30 hand-written if let Some(...) branches so the CLI surface cannot drift from the config struct.

Issue Describe / Design

Related to #1619 (partial). Depends on the stack #1620 -> #1622 -> #1623.

• Derive macro extended with an alias option.
• 27 historically tunable [fuse] fields annotated once; FuseConfCliOverrides is generated.
• Hand-written args remain only where no 1:1 scalar mapping exists: --debug/--readonly (SetTrue), --options list, --master-addrs.
• Deprecated --mnt-per-task spelling preserved as a clap alias; --meta-cache-ttl maps to meta_cache_timeout.

Changes

Module / File	Change	Impact on existing behavior
crates/common/curvine-macros/src/client_cli.rs	Add alias support to generated #[arg]s	None for existing users
crates/common/curvine-config/src/fuse_conf.rs	Derive + opt-in annotations; export FuseConfCliOverrides	None
curvine-fuse/src/cli/mount_args.rs	Replace manual override branches with one apply_to call	Known trade-off: generated flags lose per-flag help strings (restoration tracked as follow-up)
curvine-fuse/src/cli/fuse_cli.rs	Test accessors updated (args.mount.fuse.*)	Test-only

Test verified

Test case	Result	Notes
cargo test -p curvine-fuse --lib cli	PASS (35)	Includes legacy-alias and unset-flag-keeps-config-value cases
cargo test -p curvine-macros	PASS

Dependencies

• Related PRs: base refactor(config): load ClusterConf through the unified pipeline (#1619) #1623
• Related issues: [FEATURE] Unify component configuration loading, validation, and hot-reload extension points #1619

[Copilot]

Pull request overview

This PR refactors curvine-fuse mount to generate most [fuse] CLI override flags directly from FuseConf via the existing ClientCliArgs derive (opt-in), reducing manual override branches and keeping the CLI surface aligned with the config struct. It also extends the derive macro to support clap alias for deprecated flag spellings.

Changes:

• Add alias support to the ClientCliArgs derive so generated clap args can keep deprecated flag names working.
• Annotate historically tunable FuseConf fields (opt-in) and export FuseConfCliOverrides from curvine-config.
• Replace ~30 hand-written FUSE override branches in mount_args with a single generated apply_to call; update CLI tests to access args.mount.fuse.*.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
curvine-fuse/src/cli/mount_args.rs	Flatten generated FuseConfCliOverrides into mount args and apply overrides via one apply_to call; adjust tests accordingly.
curvine-fuse/src/cli/fuse_cli.rs	Update CLI tests to reference generated mount overrides under args.mount.fuse.*.
crates/common/curvine-macros/src/lib.rs	Document new #[client_cli(alias = \"...\")] field attribute.
crates/common/curvine-macros/src/client_cli.rs	Implement alias parsing and emit #[arg(alias = ...)] on generated clap fields.
crates/common/curvine-config/src/lib.rs	Re-export FuseConfCliOverrides alongside FuseConf.
crates/common/curvine-config/src/fuse_conf.rs	Derive ClientCliArgs (opt-in) and annotate fields to generate FuseConfCliOverrides; preserve legacy flag alias mappings.

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