Change wantedScripts to ordered list format

This ensures scripts execute in the order they appear in the config file,
resolving the TODO in the README. The config format has been changed from
a table with script names as keys to an ordered list of script entries.

Changes:
- ctx.lua: Use ipairs() instead of pairs() to iterate in order
- config.lua: Update validation to handle new list structure
- conf.lua: Update example config to use new format
- README.md: Remove TODO and clarify execution order

New config format:
wantedScripts = {
    {name = 'script1', config = {...}},
    {name = 'script2', config = {...}}
}

README.md

@@ -29,7 +29,7 @@ initialization will run validation of your configuration file and check
 if it is valid. if it is not you will see logs emitted about what failed
 
 when a request comes in, the scripts declared in the aproxy config file will
-be executed sequentially (TODO: ensure order on conf file is chain order).
+be executed sequentially in the order they appear in the configuration.
 
 each script has two types of callbacks: init and request
 

conf.lua

@@ -1,6 +1,11 @@
 return {
     version = 1,
     wantedScripts = {
-        ['webfinger_allowlist'] = {accounts = {"example@example.com"}}
+        {
+            name = 'webfinger_allowlist',
+            config = {
+                accounts = {"example@example.com"}
+            }
+        }
     }
 }

config.lua

@@ -84,7 +84,9 @@ end
 
 local function validateConfigFile(config_object)
     local all_schema_errors = {}
-    for module_name, module_config in pairs(config_object.wantedScripts) do
+    for _, script_entry in ipairs(config_object.wantedScripts) do
+        local module_name = script_entry.name
+        local module_config = script_entry.config
         local module_manifest = require('scripts.' .. module_name)
         local config_schema = module_manifest.config
         local schema_errors = validateSchema(config_schema, module_config)

ctx.lua

@@ -18,7 +18,9 @@ end
 
 function ctx:loadChain()
     self.compiled_chain = {}
-    for module_name, module_config in pairs(self._wanted_scripts) do
+    for _, script_entry in ipairs(self._wanted_scripts) do
+        local module_name = script_entry.name
+        local module_config = script_entry.config
         local module = require('scripts.' .. module_name)
         local module_config_readonly = table.readonly(module_config)
         local module_state = module.init(module_config_readonly)