refactor: replace lazy_static! with std::sync::LazyLock

[the-fixr]

Summary

Replace all lazy_static! macro usages across the codebase with std::sync::LazyLock from the standard library (stable since Rust 1.80). This eliminates the external lazy_static dependency from all 9 crates that used it.

Changes

34 files changed across 9 crates:

Crate	Files	Statics converted
stackslib	12	~35 (boot code, epochs, prometheus metrics, regex, test data)
stacks-common	1	3 (logger, log format, log level)
clarity	2	7 (cost types, regex patterns, lexer matchers)
clarity-types	2	8 (regex strings, serialization constants)
libsigner	1	1 (version string)
stacks-node	5	8 (test flags, test data, prometheus metrics)
stacks-signer	1	14 (prometheus metrics)
contrib/clarity-cli	1	2 (boot code arrays)

Cargo.toml changes: Removed lazy_static from [dependencies] in all 9 crate Cargo.tomls and from [workspace.dependencies] in the workspace root.

Test plan

• Mechanical conversion — LazyLock<T> implements Deref<Target = T> identically to lazy_static statics, so all access patterns are unchanged
• No remaining references to lazy_static in any .rs source file
• Cargo.lock references are from transitive dependencies only (third-party crates)

Closes #5035

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