chore: simplify, modernize (Go 1.26), update deps

[rustatian]

Applied fixes

Simplify (S) — 2 applied:

• config.go: extracted parseDSN helper to deduplicate DSN validation logic shared between Valid() and Dialer() — was copy-pasted with identical error message
• plugin.go: renamed local variable WholeCfg → wholeCfg (unexported naming convention)

Modern Go (M) — 3 applied:

• config.go:45 (Valid): strings.Split(Listen, "://") + len check → strings.Cut via parseDSN
• config.go:66 (Dialer): same strings.Split + len → strings.Cut via parseDSN
• plugin.go:128: strings.TrimPrefix + strings.Index + slice → strings.Cut

Not applied (needs manual review)

• R Med config.go:65 — Dialer() uses context.Background() instead of a caller-supplied context. Fixing this requires a signature change (Dialer(ctx context.Context)) and updating all call-sites; left for a dedicated change.

Deps

go get -u all && go mod tidy in both . and ./tests; go work sync — no version changes (all deps were already current).

Verification

go build ./...   ✓
go vet ./...     ✓
golangci-lint run → 0 issues  ✓
go test ./...    ✓ (no test files in main package; tests/ module passes)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 10688caf-fa49-4307-b203-0466231ea131

📥 Commits

Reviewing files that changed from the base of the PR and between 9091a87 and 3093e78.

📒 Files selected for processing (3)

• config.go
• plugin.go
• tests/config_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/cleanup-modernize-deps

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[Copilot]

Pull request overview

This PR simplifies and modernizes the RPC plugin by deduplicating DSN parsing/validation logic in Config and using newer strings.Cut-based parsing where applicable.

Changes:

• Extracted parseDSN helper in config.go and reused it in Valid() and Dialer().
• Renamed a local variable in plugin.go to follow unexported naming conventions and simplified service-name extraction using strings.Cut.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
config.go	Adds parseDSN helper and reuses it for config validation and dialing.
plugin.go	Minor naming cleanup and simplifies mount-path parsing for service reflection.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.94%. Comparing base (9091a87) to head (3093e78).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   61.80%   63.94%   +2.14%     
==========================================
  Files           3        3              
  Lines         144      147       +3     
==========================================
+ Hits           89       94       +5     
+ Misses         37       36       -1     
+ Partials       18       17       -1     

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