feat(db-mysql): initial implementation — database/sql MySQL with lifecycle and UnitOfWork (v1.0.0)

Introduces code.nochebuena.dev/einherjar/db-mysql — the MySQL database starter
for the Einherjar framework. Absorbs the mysql package from micro-lib using the
go-sql-driver/mysql driver, replacing fmt.Errorf wrapping with core/xerrors.

Interfaces (CT-6: one TypeSpec per file):
- Executor — ExecContext, QueryContext, QueryRowContext (database/sql types)
- Tx — Executor + Commit(), Rollback() — no ctx; honest database/sql contract
- Provider — GetExecutor, Begin, BeginTx, Ping, HandleError
- Component — lifecycle.Component + observability.Checkable + Provider + Stats()
- UnitOfWork — Do(ctx, fn)

Implementation:
- New(logger, cfg) Component — pool not created until OnInit
- OnInit: sql.Open + SetMaxOpenConns/SetMaxIdleConns/SetConnMaxLifetime/SetConnMaxIdleTime
- OnStart: Ping with 5s timeout; logs "mysql: connected"
- OnStop: db.Close(); logs "mysql: closing pool"
- GetExecutor: returns active Tx from context (ctxTxKey) or *sql.DB; explicit
  nil return when db uninitialized to avoid typed-nil interface pitfall
- Begin/BeginTx: wraps db.BeginTx(*sql.TxOptions); wrapped in xerrors on error
- HealthCheck: delegates to Ping; Priority LevelCritical
- Stats() sql.DBStats — zero value when pool uninitialized
- NewUnitOfWork(logger, provider) UnitOfWork — Begin+inject+commit/rollback;
  no write mutex (MySQL is a server DB with internal concurrency control)
- HandleError: 1062→ErrAlreadyExists, 1216/1217/1451/1452→ErrInvalidInput,
  sql.ErrNoRows→ErrNotFound, all others→ErrInternal
- Driver imported as mysqldrv alias in errors.go to avoid package-name collision;
  registered via blank import in new.go

Config (EINHERJAR_MYSQL_* env vars):
  Host, Port(3306), User, Password, Name,
  MaxConns(5), MinConns(2), MaxConnLifetime(1h), MaxConnIdleTime(30m),
  Charset(utf8mb4), Loc(UTC), ParseTime(true)

- Component interface embeds observability.Identifiable; identifiable.go implements
  ModulePath and ModuleVersion via runtime/debug.ReadBuildInfo() — prints in launcher banner

.gitea/pull_request_template.md

@@ -0,0 +1,70 @@
+## Summary
+
+<!-- One or two sentences: what does this PR do and why? -->
+
+---
+
+## Type of change
+
+- [ ] Bug fix — non-breaking change that resolves an issue
+- [ ] New feature — non-breaking addition of functionality
+- [ ] Breaking change — alters existing behavior or public API
+- [ ] Documentation update
+- [ ] Refactor — no functional change, no new API surface
+- [ ] Test improvement
+
+---
+
+## Description
+
+<!--
+Provide enough context for a reviewer who was not in the room:
+- What problem does this solve?
+- What approach did you choose, and why?
+- Were there alternatives you considered and rejected?
+- Any known limitations or follow-up work?
+-->
+
+---
+
+## Testing
+
+- [ ] I added or updated tests that cover my changes
+- [ ] All tests pass locally — `go test ./...`
+- [ ] No formatting issues — `gofmt -l .` produces no output
+- [ ] No vet warnings — `go vet ./...` is clean
+
+---
+
+## Checklist
+
+- [ ] At most one exported type per non-test `.go` file (CT-6)
+- [ ] No new external dependencies added without prior discussion in an issue
+- [ ] Public API changes are reflected in `CHANGELOG.md`
+- [ ] Breaking changes include a migration note in the PR description above
+
+---
+
+## Contributor License Agreement
+
+> **This PR will not be merged until the CLA comment is present.**
+
+Before a Maintainer reviews your code, you must post the following text **as a comment on this PR** — not here in the description. PR description checkboxes can be silently toggled by anyone; a comment is a timestamped, author-attributed record that cannot be quietly removed.
+
+**Copy and post this exact text as a PR comment:**
+
+---
+
+> I have read the Einherjar Contributor License Agreement (CLA.md) and I agree to all its terms.
+> I confirm this Contribution is my original work. I grant the Maintainers the rights described
+> therein, including the right to relicense, and I retain ownership of my copyright.
+> This agreement covers all future Contributions I submit to any Einherjar repository under
+> this account.
+
+---
+
+First time contributing? Read [CLA.md](../CLA.md) for the full agreement before posting the comment.
+
+If you are contributing on behalf of a company, an authorized representative of that company must post the comment.
+
+<!-- Thank you for contributing to Einherjar. For those who come after. -->