feat(clients): add nim-allographer client with BaraDB driver support

- Pure Nim wire protocol client (async + sync, no C FFI)
- Query Builder: fluent API, SQL generator, execution, transactions
- Schema Builder: create/alter/drop tables, column operations
- Connection pool with aging and timeout handling
- ORM integration via compile-time DB_BARADB switch
- Tests: test_open, test_query
- Documentation: README.md, PLAN_BARADB.md

clients/nim-allographer/allographer.nimble

@@ -0,0 +1,68 @@
+# Package
+
+version       = "0.32.1"
+author        = "Hidenobu Itsumura @dumblepytech1 as 'medy'"
+description   = "A Nim query builder library inspired by Laravel/PHP and Orator/Python"
+license       = "MIT"
+srcDir        = "src"
+# backend       = "c"
+# bin           = @["allographer/cli/dbtool"]
+# binDir        = "src/bin"
+# installExt    = @["nim"]
+# skipDirs      = @["allographer/cli"]
+
+# Dependencies
+
+requires "nim >= 2.0.0"
+requires "db_connector >= 0.1.0"
+requires "checksums >= 0.1.0"
+
+
+import strformat, os
+
+task test, "run testament test":
+  exec &"testament p 'tests/sqlite/test_*.nim'"
+  exec &"testament p 'tests/postgres/test_*.nim'"
+  exec &"testament p 'tests/mariadb/test_*.nim'"
+  exec &"testament p 'tests/mysql/test_*.nim'"
+  exec &"testament p 'tests/surrealdb/test_*.nim'"
+  exec &"testament p 'tests/utils/test_*.nim'"
+
+  for kind, path in walkDir(getCurrentDir() / "tests"):
+    if not path.contains(".") and path.fileExists():
+      exec "rm -f " & path
+
+task docs, "Generate API documents":
+  let
+    deployDir = &"docs/v{NimMajor}"
+    pkgDir = srcDir / "allographer"
+    srcFiles = @[
+      "connection",
+      "query_builder",
+      "schema_builder",
+    ]
+
+  if dirExists(deployDir):
+    rmDir deployDir
+  for f in srcFiles:
+    let srcFile = pkgDir / f & ".nim"
+    exec &"nim doc --hints:off --project --out:{deployDir} --index:on {srcFile}"
+
+
+let toolImage = "basolato:tool"
+
+task setupTool, "Setup tool docker image":
+  exec &"docker build -t {toolImage} -f tool_Dockerfile ."
+
+proc generateToc(dir: string) =
+  let cwd = getCurrentDir()
+  for f in listFiles(dir):
+    if 3 < f.len:
+      let ext = f[^3..^1]
+      if ext == ".md":
+        exec &"docker run --rm -v {cwd}:/work -it {toolImage} --insert --no-backup {f}"
+
+task toc, "Generate TOC":
+  generateToc(".")
+  generateToc("./documents/rdb")
+  generateToc("./documents/surrealdb")