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/docker/adminer/Dockerfile

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+FROM adminer:4.8.1-standalone
+USER root
+COPY login-password-less.php /var/www/html/plugins-enabled/login-password-less.php

clients/nim-allographer/docker/adminer/login-password-less.php

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+<?php
+require_once('plugins/login-password-less.php');
+ 
+/** Set allowed password
+ * @param string result of password_hash
+ */
+return new AdminerLoginPasswordLess(
+    $password_hash = password_hash("pass", PASSWORD_DEFAULT)
+);

clients/nim-allographer/docker/alpine/Dockerfile

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+FROM nimlang/nim:1.6.2-alpine-regular
+
+RUN echo http://dl-cdn.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories
+RUN apk update && \
+    apk upgrade --no-cache && \
+    apk add --no-cache \
+        curl \
+        gcc \
+        musl-dev \
+        bsd-compat-headers \
+        openssh-client \
+        git \
+        lcov \
+        sqlite \
+        libpq \
+        mariadb-dev \
+        openssl \
+        pcre \
+        && \
+    rm /usr/lib/mysqld* -fr && \
+    rm /usr/bin/mysql* -fr
+ENV PATH $PATH:/root/.nimble/bin
+WORKDIR /root/project
+COPY ./allographer.nimble .
+RUN nimble install -y
+RUN nimble install -y \
+           bcrypt \
+           progress

clients/nim-allographer/docker/ubuntu/Dockerfile

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+FROM ubuntu:24.04
+
+# prevent timezone dialogue
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update
+RUN apt upgrade -y
+RUN apt install -y \
+    # for build Nim and make
+    build-essential \
+    # for unzip tar.xz
+    xz-utils \
+    # for https
+    ca-certificates \
+    # for nim regex
+    libpcre3-dev \
+    vim \
+    curl \
+    git \
+    sqlite3 \
+    libpq-dev \
+    libmariadb-dev
+
+WORKDIR /root
+
+# Nim
+ARG NIM_VERSION="2.0.0"
+RUN curl https://nim-lang.org/choosenim/init.sh -o init.sh
+RUN sh init.sh -y
+RUN rm -f init.sh
+ENV PATH $PATH:/root/.nimble/bin
+RUN choosenim ${NIM_VERSION}
+
+# nimlangserver
+# https://github.com/nim-lang/langserver/releases/latest
+WORKDIR /root
+RUN curl -o nimlangserver.tar.gz -L https://github.com/nim-lang/langserver/releases/latest/download/nimlangserver-linux-amd64.tar.gz
+RUN tar zxf nimlangserver.tar.gz
+RUN rm -f nimlangserver.tar.gz
+RUN mv nimlangserver /root/.nimble/bin/
+
+WORKDIR /application
+COPY ./allographer.nimble .
+RUN nimble install -y -d
+
+RUN git config --global --add safe.directory /application
+
+WORKDIR /application

clients/nim-allographer/docker/ubuntu/test.Dockerfile

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+FROM ubuntu:24.04
+
+# prevent timezone dialogue
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update
+RUN apt upgrade -y
+RUN apt install -y \
+    gcc \
+    xz-utils \
+    ca-certificates \
+    libpcre3-dev \
+    curl \
+    git \
+    sqlite3 \
+    libpq-dev \
+    libmariadb-dev
+
+# gcc... for Nim
+# xz-utils... for unzip tar.xz
+# ca-certificates... for https
+# libpcre3-dev... for nim regex
+
+WORKDIR /root
+
+# Nim
+ARG NIM_VERSION="2.0.0"
+RUN curl https://nim-lang.org/choosenim/init.sh -o init.sh
+RUN sh init.sh -y
+RUN rm -f init.sh
+ENV PATH $PATH:/root/.nimble/bin
+RUN choosenim ${NIM_VERSION}
+
+WORKDIR /root/project
+COPY ./allographer.nimble .
+RUN nimble install -y -d
+
+RUN git config --global --add safe.directory /root/project
+
+WORKDIR /root/project