Migrate to pnpm

[tudddorrr]

Package manager switch

• Migrated dependency management from npm to pnpm 12, replacing package-lock.json with pnpm-lock.yaml.
• Added pnpm-workspace.yaml and a devEngines.packageManager entry so pnpm 12 is enforced on install.
• Allow-listed postinstall build scripts for bcrypt, esbuild, msgpackr-extract and protobufjs, which pnpm blocks by default.

CI and Docker

• Replaced setup-node and manual node_modules caching with the pnpm/setup action (cache: true) in the CI setup action, CI workflow and release workflow.
• Rewrote the Dockerfile to build from the official pnpm image and install with --frozen-lockfile, keeping the store cache mounted for faster installs.
• Swapped all workflow script invocations (test, tsc, build, fmt, lint, vitest merge) from npm/npx to pnpm equivalents.

Local tooling and docs

• Updated the husky pre-commit hook, lint-staged config and repo scripts (restart, migration:create, build) to run through pnpm.
• Refreshed AGENTS.md, CONTRIBUTING.md and the new-route skill so all documented commands use pnpm.

Dependency adjustments

• Added @otplib/preset-default and @types/qs to make explicit what was previously pulled in transitively.
• Pinned stripe to an exact version and added explicit types for the nodemailer mock.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.39%. Comparing base (b0c4c12) to head (2e4479c).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1043   +/-   ##
========================================
  Coverage    98.39%   98.39%           
========================================
  Files          467      467           
  Lines         7462     7462           
  Branches       984      984           
========================================
  Hits          7342     7342           
  Misses          49       49           
  Partials        71       71           

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