Add more PaaS (PostgreSQL as a Service) providers

[belo4ya]

This PR significantly expands the PaaS (PostgreSQL as a Service) section by adding a broad set of currently active platforms that provide managed PostgreSQL offerings. The list is based on a personal long-term collection of managed PostgreSQL services and cloud platforms. I actively use accounts in many of these services, including their free-tier plans where available. I also use this list to track ongoing innovation in the PostgreSQL ecosystem and to observe how commercial providers differentiate their offerings (e.g. serverless architectures, branching, multi-tenant models, regional clouds, etc.).

The list items were sorted in alphabetical order.

One pull request for one item.

I have reviewed the repository’s Contribution Guidelines репозитория, but I do not consider it practical to split this PR into 30+ separate ones. However, if this is strongly preferred, I am willing to do so.

I did not spend much effort on crafting the descriptions for each item - most descriptions were taken directly from providers’ landing pages, which makes some of them sound marketing-oriented. Where such descriptions were not available, I tried to write concise and neutral summaries (with the help of an LLM; for example, "Managed PostgreSQL on Akamai/Linode with automated provisioning, backups, and maintenance").

Links for Selectel Cloud for PostgreSQL, Cloud.ru Evolution Managed PostgreSQL, VK Cloud PostgreSQL as a Service, MWS Managed PostgreSQL, Timeweb Cloud Managed Service for PostgreSQL point to landing pages in local languages rather than English, as equivalent English pages do not exist. Please let me know if this is an issue.

Disclaimer: I am affiliated with Cloud.ru as an engineer working on Managed PostgreSQL.

[NikolayS]

I think it makes sense to point explicitly in which jurisdiction each service works

[belo4ya]

Do you have a preference for how to present this?

One idea is to add short availability/market tags at the end of each entry, e.g. (global, us, eu, apac, cn, ru, cis, multicloud). For example:

Alibaba Cloud ApsaraDB RDS for PostgreSQL - An on-demand database hosting service for PostgreSQL with automated monitoring, backup and disaster recovery capabilities. (cn, global)
Yandex Cloud Managed Service for PostgreSQL - Managed PostgreSQL clusters in Yandex Cloud infrastructure. (ru, cis)

each service

To keep it readable and accurate, I could apply tags only where the service is clearly region-limited or market-specific (e.g., CN/CIS/EU-only). For broadly available services I’d omit tags unless there’s a clear regions reference.

[kmoppel]

@belo4ya Wow, crazy amount of services, had no idea that there were so many, thanks!....But, yes making marking strictly country-based offerings would be very useful for users / readers indeed, so do please add all the limitations info you have in parentheses,

[belo4ya]

added tags: (ru), (ru, cis), (cn, apac), (eu-focused)