fix: short-syntax env_file is optional, not required

[FIERsity]

Bug

String-form env_file: was normalized to required: true, so a missing env file — the gitignored .env in a fresh clone, or mastodon .env.production — produced a hard I/O error. docker compose config treats it as a notice and exits 0 (verified against Docker).

Fix

• Short-syntax env_file → optional; missing files are skipped with info [env-file-missing]
• ServiceReport.diagnostics added (JSON additive) and surfaced through the audit
• Long syntax {path, required: true} still errors as before

Verification

• New integration test (missing env_file → audit success + env-file-missing)
• mastodon real compose: hard error → clean audit with 3 info notices
• 136 tests green, clippy -D warnings clean

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📥 Commits

Reviewing files that changed from the base of the PR and between 85e273d and ff0d124.

📒 Files selected for processing (5)

• src/audit.rs
• src/compose.rs
• src/graph.rs
• src/model.rs
• tests/cli.rs

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