feat(scanner): agree on a standard issue_ref format for findings

[dezzy-music]

Description

Proposes and formalizes a standardized finding reference grammar across DepRadar off-chain crawlers, on-chain contracts, and the dashboard:
<ecosystem>:<package>[@<version>]#<kind>[:<advisory>]

Provides complete parsing and formatting utilities with round-trip unit tests in both Rust (deprader::model) and TypeScript (frontend/src/lib/format.ts), accompanied by comprehensive documentation in docs/issue-ref.md.

Closes #162

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Tasks Completed

• Documented grammar, fields, canonical examples, and compatibility rules in docs/issue-ref.md.
• Implemented FindingRef, format_issue_ref, and parse_issue_ref in src/model.rs (exposed via src/lib.rs).
• Implemented FindingRef interface, formatIssueRef, and parseIssueRef in frontend/src/lib/format.ts.
• Added round-trip tests in Rust (src/model.rs, 30 tests in crate).
• Added round-trip tests in TypeScript (frontend/src/lib/format.test.ts, 25 tests in dashboard).
• Documented the change in PROGRESS.md.

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Acceptance Criteria

• Round-trip tests in both languages (Rust + TypeScript)
• cargo fmt, cargo clippy -- -D warnings and cargo test --workspace pass
• npm run lint, typecheck, test and build pass in frontend/
• All commands and links in the new docs verified
• PROGRESS.md entry added, and the PR description includes Closes #162

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Stellar Address (Stellar Wave Program)

GDLCJGQLXZGDAAT5QGRF6FM2MBEER3FPYGCSVPXYL47G2ABIOX2M2S6K