Add external dependencies CI/CD pipelines with SBOM generation

- Create external-dependencies directory structure with per-package pipelines
- Add DEPENDENCIES-INVENTORY.md with comprehensive dependency tracking
- Create ubuntu-26.04-build-container base image with all dependencies
- Add per-package Jenkinsfiles: log4qt, grantlee, googletest, postgresql, qt6-framework, kdreports
- Add SBOM generation script (generate-sbom.sh) for CycloneDX, SLSA v1.0, and license reports
- Integrate SBOM generation into all Jenkins pipelines
- Add external-dependencies/README.md with usage and security documentation
- Exclude proprietary license files (rti_license.dat) from git tracking

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Entire-Checkpoint: 01M6KNFNMSPW4SY4J4SQTTPVBP

external-dependencies/grantlee/Dockerfile

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+# Grantlee Installation
+FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
+
+LABEL maintainer="Legatus Team"
+LABEL description="Grantlee templating engine for Qt6"
+LABEL version="5.3.1"
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+ARG HTTP_PROXY=""
+ARG HTTPS_PROXY=""
+ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+
+ENV http_proxy=${HTTP_PROXY}
+ENV https_proxy=${HTTPS_PROXY}
+ENV no_proxy=${NO_PROXY}
+
+ARG QT_VERSION=6.10.2
+ARG GRANTLEE_VERSION=5.3.1
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential cmake git \
+    libqt6core6 libqt6gui6 libqt6widgets6 \
+    qt6-base-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Clone and build Grantlee
+RUN git clone --depth 1 --branch ${GRANTLEE_VERSION} \
+    https://github.com/steveire/grantlee.git /tmp/grantlee \
+    && cd /tmp/grantlee \
+    && mkdir build && cd build \
+    && cmake -DCMAKE_BUILD_TYPE=Release \
+             -DCMAKE_INSTALL_PREFIX=/usr/local \
+             -DCMAKE_PREFIX_PATH=/opt/Qt/${QT_VERSION}/gcc_64 \
+             -DGRANTLEE_BUILD_WITH_QT6=ON \
+             .. \
+    && cmake --build . -j$(nproc) \
+    && cmake --install . \
+    && rm -rf /tmp/grantlee
+
+# Update library cache
+RUN ldconfig
+
+# Verify installation
+RUN pkg-config --modversion Grantlee | grep -q "${GRANTLEE_VERSION}"
+
+CMD ["/bin/bash"]

external-dependencies/grantlee/Jenkinsfile

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+pipeline {
+    agent any
+
+    environment {
+        QT_VERSION = '6.10.2'
+        GRANTLEE_VERSION = '5.3.1'
+        HARBOR_REGISTRY = 'harbor.sl.defence-elec.de/proxydockerhub'
+        IMAGE_NAME = 'grantlee'
+        IMAGE_TAG = "${GRANTLEE_VERSION}"
+    }
+
+    options {
+        timeout(time: 20, unit: 'MINUTES')
+        buildDiscarder(logRotator(numToKeepStr: '10'))
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+            }
+        }
+
+        stage('Build Grantlee Container') {
+            steps {
+                script {
+                    dir('external-dependencies/grantlee') {
+                        sh """
+                            docker build \
+                              --build-arg QT_VERSION=${QT_VERSION} \
+                              --build-arg GRANTLEE_VERSION=${GRANTLEE_VERSION} \
+                              -t ${HARBOR_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} \
+                              .
+                        """
+                    }
+                }
+            }
+        }
+
+        stage('Verify Grantlee') {
+            steps {
+                script {
+                    sh """
+                        docker run --rm ${HARBOR_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} bash -c '
+                          pkg-config --modversion Grantlee
+                        '
+                    """
+                }
+            }
+        }
+
+        stage('Generate SBOM') {
+            steps {
+                script {
+                    dir('external-dependencies/grantlee') {
+                        sh """
+                            mkdir -p sbom
+                            
+                            # Set environment variables for SBOM generation
+                            export GIT_URL="${env.GIT_URL}"
+                            export GIT_COMMIT="${env.GIT_COMMIT}"
+                            export BUILD_NUMBER="${env.BUILD_NUMBER}"
+                            export DOCKERFILE_PATH="external-dependencies/grantlee/Dockerfile"
+                            
+                            # Generate CycloneDX SBOM, SLSA provenance, and license report
+                            bash ../scripts/generate-sbom.sh grantlee ${GRANTLEE_VERSION} ./sbom
+                        """
+                    }
+                }
+            }
+        }
+
+        stage('Push to Registry') {
+            steps {
+                script {
+                    withCredentials([usernamePassword(
+                        credentialsId: 'harbor-credentials',
+                        usernameVariable: 'HARBOR_USER',
+                        passwordVariable: 'HARBOR_PASSWORD'
+                    )]) {
+                        sh """
+                            echo ${HARBOR_PASSWORD} | docker login ${HARBOR_REGISTRY} -u ${HARBOR_USER} --password-stdin
+                            docker push ${HARBOR_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}
+                            docker logout ${HARBOR_REGISTRY}
+                        """
+                    }
+                }
+            }
+        }
+    }
+
+    post {
+        always {
+            cleanWs()
+        }
+    }
+}

external-dependencies/grantlee/README.md

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+# Grantlee
+
+Grantlee templating engine with Qt6 support.
+
+## Version
+
+- **Grantlee:** 5.3.1 (5.3.1 tag)
+- **Repository:** https://github.com/steveire/grantlee
+- **License:** LGPL
+
+## Installation
+
+```bash
+git clone --depth 1 --branch 5.3.1 https://github.com/steveire/grantlee.git /tmp/grantlee
+cd /tmp/grantlee
+mkdir build && cd build
+cmake -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_INSTALL_PREFIX=/usr/local \
+      -DCMAKE_PREFIX_PATH=/opt/Qt/6.10.2/gcc_64 \
+      -DGRANTLEE_BUILD_WITH_QT6=ON \
+      ..
+cmake --build . -j$(nproc)
+cmake --install .
+```
+
+## Note
+
+Ubuntu's `grantlee-dev` package is Qt5-based. Must build from source for Qt6 support.
+
+## Verification
+
+```bash
+pkg-config --modversion Grantlee
+```
+
+## SBOM
+
+- `sbom/grantlee-5.3.1-sbom.json`
+- `sbom/grantlee-5.3.1-provenance.json`
+- `sbom/grantlee-5.3.1-licenses.md`