docs: update zellij-ps to reflect project switcher functionality

- Update package description and fix mainProgram typo
- Rewrite documentation to describe project switching, not process viewing
- Add PROJECT_FOLDERS configuration and usage examples
- Update all references across docs (README, guides, module overviews)

docs/modules/nixos/ports.md

@@ -0,0 +1,229 @@
+# ports NixOS Module
+
+Port management module for NixOS.
+
+## Overview
+
+This module provides centralized port management across multiple hosts. Define default ports and host-specific overrides to prevent conflicts.
+
+See [Port Management Guide](../../guides/port-management.md) for detailed usage.
+
+## Quick Start
+
+```nix
+{config, ...}: {
+  m3ta.ports = {
+    enable = true;
+
+    # Define default ports
+    definitions = {
+      nginx = 80;
+      grafana = 3000;
+      prometheus = 9090;
+    };
+
+    # Host-specific overrides
+    hostOverrides = {
+      laptop = {
+        nginx = 8080;
+        grafana = 3001;
+      };
+    };
+
+    # Current host
+    currentHost = config.networking.hostName;
+  };
+}
+```
+
+## Module Options
+
+### `m3ta.ports.enable`
+
+Enable port management.
+
+- Type: `boolean`
+- Default: `false`
+
+### `m3ta.ports.definitions`
+
+Default port definitions.
+
+- Type: `attrsOf int`
+- Default: `{}`
+
+Example:
+
+```nix
+definitions = {
+  nginx = 80;
+  grafana = 3000;
+  prometheus = 9090;
+};
+```
+
+### `m3ta.ports.hostOverrides`
+
+Host-specific port overrides.
+
+- Type: `attrsOf (attrsOf int)`
+- Default: `{}`
+
+Example:
+
+```nix
+hostOverrides = {
+  laptop = {
+    nginx = 8080;
+    grafana = 3001;
+  };
+  server = {
+    nginx = 80;
+    prometheus = 9091;
+  };
+};
+```
+
+### `m3ta.ports.currentHost`
+
+Current hostname. Determines which overrides to apply.
+
+- Type: `string`
+- Example: `config.networking.hostName`
+
+## Functions
+
+### `config.m3ta.ports.get "service"`
+
+Get port for a service with host-specific override.
+
+```nix
+services.nginx = {
+  port = config.m3ta.ports.get "nginx";
+};
+```
+
+If current host is `laptop` and `hostOverrides.laptop.nginx = 8080`, returns `8080`.
+If no override, returns default `80`.
+
+### `config.m3ta.ports.getHostPorts "hostname"`
+
+Get all ports for a specific host.
+
+```nix
+# Get all ports for laptop
+laptopPorts = config.m3ta.ports.getHostPorts "laptop";
+# Returns: { nginx = 8080; grafana = 3000; ... }
+```
+
+### `config.m3ta.ports.listServices`
+
+List all defined service names.
+
+```nix
+allServices = config.m3ta.ports.listServices;
+# Returns: ["nginx" "grafana" "prometheus"]
+```
+
+## Usage Examples
+
+### Basic Usage
+
+```nix
+{config, ...}: {
+  m3ta.ports = {
+    enable = true;
+    definitions = {
+      nginx = 80;
+      grafana = 3000;
+    };
+    currentHost = "server";
+  };
+
+  services.nginx = {
+    enable = true;
+    httpConfig = ''
+      server {
+        listen ${toString (config.m3ta.ports.get "nginx")};
+      }
+    '';
+  };
+}
+```
+
+### Multi-Host Setup
+
+```nix
+{config, ...}: {
+  m3ta.ports = {
+    enable = true;
+    definitions = {
+      nginx = 80;
+      grafana = 3000;
+      prometheus = 9090;
+    };
+    hostOverrides = {
+      laptop = {
+        nginx = 8080;
+        grafana = 3001;
+      };
+      server = {
+        nginx = 80;
+        grafana = 3000;
+      };
+    };
+    currentHost = config.networking.hostName;
+  };
+
+  services.nginx = {
+    enable = true;
+    httpConfig = ''
+      server {
+        listen ${toString (config.m3ta.ports.get "nginx")};
+      }
+    '';
+  };
+}
+```
+
+### With Multiple Services
+
+```nix
+{config, ...}: {
+  m3ta.ports = {
+    enable = true;
+    definitions = {
+      # Monitoring
+      grafana = 3000;
+      prometheus = 9090;
+      loki = 3100;
+      promtail = 9080;
+
+      # Web
+      nginx = 80;
+
+      # Databases
+      postgres = 5432;
+      redis = 6379;
+      qdrant = 6333;
+    };
+    currentHost = config.networking.hostName;
+  };
+
+  # Use ports
+  services.grafana = {
+    enable = true;
+    settings.server.http_port = config.m3ta.ports.get "grafana";
+  };
+
+  services.postgresql = {
+    enable = true;
+    port = config.m3ta.ports.get "postgres";
+  };
+}
+```
+
+## Related
+
+- [Port Management Guide](../../guides/port-management.md) - Detailed guide
+- [Home Manager Ports Module](../home-manager/ports.md) - User-level port management