Remove Exoscale support due to CloudStack API deprecation (#14841)

* Remove Exoscale support due to CloudStack API deprecation (fixes #14839)

Exoscale deprecated their CloudStack API on May 1, 2024, migrating to a
proprietary API v2 that is incompatible with CloudStack-based tools.

Changes:
- Remove Exoscale as default CloudStack endpoint
- Add detection and clear error message for Exoscale endpoints
- Update documentation to remove Exoscale references
- Add recommendations for alternative providers
- Maintain generic CloudStack support for other providers

Users attempting to use Exoscale will now receive a helpful error message
explaining the situation and suggesting alternative providers with European
presence (Hetzner, DigitalOcean, Vultr, Scaleway).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Remove remaining Exoscale references from input.yml, README, and prompts

- Removed 'Exoscale optimised' label from CloudStack in input.yml
- Removed Exoscale mention from README.md provider list
- Removed Exoscale URL example from CloudStack API endpoint prompt

* Fix typo: 'API ssecret' -> 'API secret' in CloudStack prompt

---------

Co-authored-by: Claude <noreply@anthropic.com>

roles/cloud-cloudstack/tasks/prompts.yml

@@ -12,7 +12,7 @@
 
     - pause:
         prompt: |
-          Enter the API ssecret (https://trailofbits.github.io/algo/cloud-cloudstack.html):
+          Enter the API secret (https://trailofbits.github.io/algo/cloud-cloudstack.html):
         echo: false
       register: _cs_secret
       when:
@@ -23,7 +23,6 @@
     - pause:
         prompt: |
           Enter the API endpoint (https://trailofbits.github.io/algo/cloud-cloudstack.html)
-          [https://api.exoscale.com/compute]
       register: _cs_url
       when:
         - cs_url is undefined
@@ -34,10 +33,26 @@
         algo_cs_token: "{{ cs_secret | default(_cs_secret.user_input | default(None)) | default(lookup('env', 'CLOUDSTACK_SECRET'), true) }}"
         algo_cs_url: >-
           {{ cs_url | default(_cs_url.user_input|default(None)) |
-             default(lookup('env', 'CLOUDSTACK_ENDPOINT'), true) |
-             default('https://api.exoscale.com/compute', true) }}
+             default(lookup('env', 'CLOUDSTACK_ENDPOINT'), true) }}
       no_log: true
 
+    - name: Check for Exoscale API endpoint
+      fail:
+        msg: |
+          ERROR: Exoscale CloudStack API has been deprecated as of May 1, 2024.
+
+          Exoscale has migrated from CloudStack to their proprietary API v2, which is not compatible
+          with CloudStack-based tools. Algo no longer supports Exoscale deployments.
+
+          Please consider these alternative providers:
+          - Hetzner (provider: hetzner) - German provider with European coverage
+          - DigitalOcean (provider: digitalocean) - Has Amsterdam and Frankfurt regions
+          - Vultr (provider: vultr) - Multiple European locations
+          - Scaleway (provider: scaleway) - French provider
+
+          If you're using a different CloudStack provider, please provide the correct API endpoint.
+      when: "'exoscale.com' in algo_cs_url or 'exoscale.ch' in algo_cs_url"
+
     - name: Get zones on cloud
       cs_zone_info:
       register: _cs_zones
@@ -53,10 +68,7 @@
 
     - name: Set the default zone
       set_fact:
-        default_zone: >-
-          {%- for z in cs_zones -%}
-          {%- if z['name'] == "ch-gva-2" %}{{ loop.index }}{% endif -%}
-          {%- endfor %}
+        default_zone: "1"  # Default to first zone in the list
 
     - pause:
         prompt: |