Statistics ON causes 95–100% Disk 0 active time; OFF drops it immediately to 0% (8.0.5560.0)

### Please answer the following questions for yourself before submitting an issue

- [x] Filters were updated before reproducing an issue
- [x] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [x] I checked to make sure that this issue has not already been filed

### AdGuard version

8.0.5560.0

### Browser version

Not applicable (system-wide disk I/O issue; reproduced independently of browser)

### OS version

Windows 11 25H2, build 26200.9168

### Traffic filtering

- [x] yes, I do

### Ad Blocking

_No response_

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

_No response_

### Language-specific

_No response_

### Which DNS server do you use?

DNS protection disabled

### DNS protocol

None

### Custom DNS

_No response_

### What Stealth Mode options do you have enabled?

_No response_

### Support ticket ID

_No response_

### Issue Details

Steps to reproduce:
1. Run AdGuard for Windows 8.0.5560.0 with protection enabled.
2. Enable Statistics.
3. Observe Disk 0 active time increase to 95–100%; Windows becomes extremely slow.
4. Disable Statistics.
5. Observe Disk 0 active time immediately fall to 0%.
6. Re-enable Statistics and repeat; the pattern is reproducible.

The A/B result is immediate and consistent:
- AdGuard enabled + Statistics OFF: Disk 0 = 0%, queue = 0, read/write = 0.
- Statistics ON: Disk 0 = approximately 95–100%.
- Statistics OFF again: Disk 0 = 0% immediately.

During the affected state, Resource Monitor repeatedly shows activity against `C:\ProgramData\Adguard\statistics.db-wal`.

I searched the open issues before filing. #5620 is related, but it describes temporary disk usage after service/OS startup, not this persistent and immediately reversible Statistics ON/OFF pattern. #5809 is closed as Cannot Reproduce and did not isolate Statistics as the trigger.

### Expected Behavior

Statistics collection should operate without saturating the system disk or making Windows unresponsive. Disabling Statistics should not be required to keep disk latency and active time normal.

### Actual Behavior

With Statistics enabled, Disk 0 reaches 95–100% active time and Windows becomes extremely slow. Disabling Statistics makes Disk 0 fall immediately to 0%. The behavior returns when Statistics is enabled again.

Observed maximum latencies:
- One reproduction: Read 489 ms / Write 1613 ms.
- Other reproductions: Read 229 ms / Write 353 ms.

Current workaround: keep Statistics disabled while leaving AdGuard protection enabled.

### Screenshots

Screenshot 1

### Additional Information

### Environment
- AdGuard for Windows: 8.0.5560.0
- OS: Windows 11 25H2, build 26200.9168
- System disk: Crucial T710 4 TB
- SSD firmware: PBCR5103
- NVMe driver: `stornvme.sys` 10.0.26100.8972
- Free space during testing: 814 GB
- TRIM: enabled
- SSD health: Healthy

### Diagnostics already performed
- No relevant errors from stornvme, storport, Disk, or WHEA.
- SFC and DISM completed cleanly.
- Reproduced with Windows Search disabled.
- PCIe ASPM was disabled.
- AdGuard VPN 2.10.2148.0 was ruled out as the primary cause: stopping it reduced activity only slightly, while the Statistics ON/OFF change in AdGuard for Windows controls the symptom immediately.

### Fresh statistics database test
The existing `statistics.db` (approximately 11.09 MB) was moved to a backup and AdGuard was allowed to create a fresh statistics database. The problem still reproduced, so recreating the database did not resolve it.

Related issues: #5620 and #5809.