Entangled photon pair sources are a key enabling technology for quantum communication and networking, yet their deployment beyond laboratory environments is hindered by system-level complexity, limited operational stability, and insufficient industry compatibility. Here, we demonstrate a rack-based, mobile quantum light source architecture based on a semiconductor quantum dot emitter that directly addresses these challenges through modular system integration and automated quantum state verification. The source generates polarization-entangled photon pairs with an entanglement negativity (Formula presented.) of up to (Formula presented.), confirming near-maximal entanglement quality. In continuous, hands-off operation over a 6 h time window, the system achieves an average combined exciton and biexciton single-photon count rate of (Formula presented.) kHz and a maximum rate of (Formula presented.) kHz, while maintaining a (Formula presented.) of more than 95%. These results are enabled by the integration of optical excitation, collection, cryogenic operation, and control electronics within a standardized rack footprint, together with automated monitoring. By demonstrating simultaneously high entanglement quality, sustained brightness over a 6 h period, and inherent architectural robustness in an industry-aligned system, this work advances semiconductor quantum dot devices toward deployable entangled photon sources for applied quantum photonics.