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docs: synchronize Node.js and PostgreSQL version requirements across … (#11689)

## Description

This PR resolves multiple inconsistencies in the documented and enforced
Node.js and PostgreSQL versions across the repository. Previously, a
contributor could find mentions of Node 18, 20, and 22 depending on
which file they read.

### The Problem
*
**[.node-version](cci:7://file:///home/13769K/Git/forks/unleash/.node-version:0:0-0:0)**
was set to **22.22**.
*
**[backend/overview.md](cci:7://file:///home/13769K/Git/forks/unleash/contributing/backend/overview.md:0:0-0:0)**
recommended **Node 22** and **PostgreSQL 14**.
*
**[CONTRIBUTING.md](cci:7://file:///home/13769K/Git/forks/unleash/contributing/CONTRIBUTING.md:0:0-0:0)**
had conflicting mentions of **Node 20** (L11) and **Node 18** (L39),
along with **PostgreSQL 13**.
* **Root
[package.json](cci:7://file:///home/13769K/Git/forks/unleash/package.json:0:0-0:0)**
only enforced **Node >=20**.
*
**[frontend/package.json](cci:7://file:///home/13769K/Git/forks/unleash/frontend/package.json:0:0-0:0)**
only enforced **Node >=18**.

### The Solution
To eliminate confusion, this PR standardizes all requirements on **Node
22.0+** and **PostgreSQL 14.0+**, aligning them with the current CI/CD
environment and the
[.node-version](cci:7://file:///home/13769K/Git/forks/unleash/.node-version:0:0-0:0)
file.

## Changes
-
**[CONTRIBUTING.md](cci:7://file:///home/13769K/Git/forks/unleash/contributing/CONTRIBUTING.md:0:0-0:0)**:
Updated general instructions to specify Node 22 and PostgreSQL 14.
-
**[package.json](cci:7://file:///home/13769K/Git/forks/unleash/package.json:0:0-0:0)
(Root)**: Bumped `engines.node` to `>=22`.
-
**[frontend/package.json](cci:7://file:///home/13769K/Git/forks/unleash/frontend/package.json:0:0-0:0)**:
Bumped `engines.node` to `>=22`.

## Verification Results
- [x] Verified
[.node-version](cci:7://file:///home/13769K/Git/forks/unleash/.node-version:0:0-0:0)
content matches the new documentation.
- ... (continued)

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