Regarding the status quo: Yes, mandates exist. The school example is a piece of paper you turn into the school office during enrollment and no one ever thinks about it again. It's not a status tracked in real time, apps don't have to be presented to enter buildings. And in most cases, people can file for exemptions if it really matters to them.
My friend started college in his late 30s and didn't have access to his childhood immunizations since it was so long ago. He had to get a blood test showing immunity before he could attend class.
Government mandating private business to inject their workers every 6 months to save face (and $$$) for the "vaccine" manufacturers is fascist and anti-human. Thankfully the over-arching Biden mandate probably won't go anywhere, but large companies such as Google are doing this as a political and financial move. NOT FOR HEALTH
When politics and money make it necessary for companies to coerce people into injections every 6 months, a constantly shifting definition of "vaccinated", then things should be re-evaluated. And if you believe in this garbage you should honestly re-evaluate your concept of liberty.
“all civil rights” meaning you have full civil rights but can't force a private company to give you a job when you refuse to follow safety rules? Especially in a country where employers pay for healthcare it doesn't seem unreasonable to require a safe, easy, and highly effective means of avoiding very expensive treatments.
This is also far from unprecedented. I've worked at jobs which required other vaccinations, schools all around the country require a ton of vaccinations, and the people who don't want to do that for whatever reason have always had the option of homeschooling, finding another job, etc. If this is such an important issue to you, take responsibility for the consequences of your choice — there's certainly a long tradition of people accepting that as a cost of their religious decisions.