Bump version to 1.1.6; fix storage bugs, tests, CI pipeline and Docker config

Storage fixes:
- Fix bloom filter hash2 OverflowDefect (uint64 instead of int Hash)
- Fix MemTable.put size calculation on overwrite (was leaking size)
- Fix fuzz_test duplicate-key issues in LSM delete and SSTable tests

Test fixes:
- Fix stress_test.nim: replace deprecated threadpool with std/threads
- Fix fuzz_test.nim: add missing imports (tables, algorithm, sets)
- Fix fuzz_test.nim: var sst for close() compatibility
- Remove unused imports from test_all.nim and bench_all.nim

Docker / CI fixes:
- Fix Dockerfile.source: invalid nimlang/nim:2.2.10-alpine tag → 2.2.10 + ubuntu:24.04 runtime
- Fix Dockerfile.source healthcheck (--spider → -qO- for 200 OK)
- Fix Dockerfile run comment ports (9470/9471 → 9912/9913)
- Fix scripts/docker-run.sh healthcheck port (9470 → 9912)
- Add ARG BUILD_DATE/VCS_REF to Dockerfile for docker-build.sh
- Update all version strings 1.1.4 → 1.1.6 across nimble/docker/source/docs

docs/en/changelog.md

@@ -65,7 +65,7 @@ All notable changes to BaraDB are documented in this file.
 
 ### Added
 
-- **Client SDKs v1.1.4** — Full-featured clients for all languages:
+- **Client SDKs v1.1.6** — Full-featured clients for all languages:
   - JavaScript: TypeScript definitions, package.json, examples, unit & integration tests
   - Python: Restructured as proper package (`baradb/` with `__init__.py` and `core.py`), pyproject.toml, examples, tests (query builder, wire protocol, integration)
   - Nim: Examples, integration tests, README
@@ -96,7 +96,7 @@ All notable changes to BaraDB are documented in this file.
 ### Changed
 
 - **Version bumped to 1.1.0** across all components (server, Docker images, clients, CLI)
-- **README** — Version badge updated; all feature tables now reference v1.1.4
+- **README** — Version badge updated; all feature tables now reference v1.1.6
 - **TLA+ Formal Verification** — Added `crossmodal.tla`, `backup.tla`, `recovery.tla`; symmetry reduction in all 9 specs
 - **Clean build** — 0 compiler warnings on Nim 2.2.10