…tes, and bulk issue/PR tooling (#161)

## Summary

* Hopefully enables Window binary releases by removing the SPC v2.8.2
workarounds due to fixes now available in [static-php-cli
2.8.3](https://github.com/crazywhalecc/static-php-cli/releases/tag/2.8.3)
specifically as part of
crazywhalecc/static-php-cli#1066
* Adds an artificial 5s delay into the npm binary uploads/releases to
avoid any issues (preemptive fix)
* Adds a triage bot (runs on issue/PR creation and update events)
* Bulk issue / PRs triage with `scripts/manage_prs.sh`, structured issue
templates, and a batch close workflow for cleaning up historical issues
and PRs efficiently

## Changes

### Issue templates
- `bug.yml` — structured form: DBDiff version, PHP version, install
method, database, OS, command, expected/actual behaviour
- `feature.yml` — problem/solution/alternatives form
- `config.yml` — disables blank issues

### Triage workflow (`.github/workflows/triage.yml`)
Three jobs triggered at the right times:

| Job | Triggers | What it does |
|-----|----------|-------------|
| `triage` | Issue/PR opened | Auto-labels by type, DB, PR content; asks
for missing info; links similar issues; detects `good first issue`
candidates |
| `re-evaluate` | Edited, commented, reopened | Removes `needs-info`
when info is provided; removes `stale` on new activity. Metadata labels
(`bug`, `mysql`, etc.) are never removed. |
| `stale` | Weekly cron (Mon 06:00 UTC) | Marks stale after 90 days;
closes after 14 more days of silence |

### Batch close workflow (`.github/workflows/batch-close.yml`)
- Triggered via `workflow_dispatch` — paste the batch template into the
input field in the Actions UI
- Dry-run toggle (defaults to `true`)
- Comments post as `github-actions[bot]`
- Full output captured to the job's step summary for debugging

### `scripts/manage_prs.sh` enhancements
- **Validation** — `validate_batch_file()` checks every line before any
changes are made; reports all errors with line numbers
- **Idempotency** — skips already-closed issues/PRs and `create` entries
where an issue with the same title already exists
- Added `Issues Created` and `Skipped (Already Done)` to summary output

### `scripts/batch-close-template.txt`
Reference template documenting the `type|number|labels|comment` format
and the `create|labels|title|body` variant.

### `release.yml` cleanup
Removed SPC v2.8.2 workarounds (`SPC_EXTRA_LIBS`, stale comments)
superseded by the upstream fix in SPC 2.8.3.

## Testing
- `bash -n scripts/manage_prs.sh` — syntax check passes
- Dry-run of `v3-close-batch.txt` (65 entries) completes correctly
- Validation rejects malformed entries with line-specific errors
- YAML validated for both new workflows