Add qlty code quality configuration and GitHub Actions workflow

.github/workflows/qlty.yml

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+name: Code Quality Check
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  qlty:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v5
+
+    - name: Install qlty
+      run: |
+        # Install qlty using official install script
+        curl https://qlty.sh | sh
+        echo "$HOME/.qlty/bin" >> $GITHUB_PATH
+
+    - name: Run qlty check
+      run: qlty check

.qlty/.gitignore

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+*
+!configs
+!configs/**
+!hooks
+!hooks/**
+!qlty.toml
+!.gitignore

.qlty/configs/.hadolint.yaml

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+ignored:
+  - DL3008

.qlty/configs/.shellcheckrc

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+source-path=SCRIPTDIR

.qlty/configs/.yamllint.yaml

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+extends: default
+
+rules:
+  document-start: disable
+  quoted-strings:
+    required: only-when-needed
+    extra-allowed: ["{|}"]
+  key-duplicates: {}
+  octal-values:
+    forbid-implicit-octal: true
+  line-length: disable
+  indentation: disable
+  new-line-at-end-of-file: disable
+  trailing-spaces: disable
+  brackets: disable
+  colons: disable
+  empty-lines: disable
+  comments: disable
+  braces: disable
+  comments-indentation: disable
+  commas: disable

.qlty/configs/dialyzer.config

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+%% Dialyzer configuration for epp_proxy project
+[
+  {dialyzer,
+   [
+    {warnings, [unknown, unmatched_returns, error_handling, race_conditions, underspecs]},
+    {plt_apps, [erts, kernel, stdlib, ssl, public_key, crypto, asn1, xmerl, inets, mnesia, os_mon, runtime_tools, sasl, tools, webtool, debugger, observer, et, wx]},
+    {plt_location, local},
+    {base_plt_apps, [erts, kernel, stdlib]},
+    {files_rec, ["apps/epp_proxy/src"]},
+    {from, byte_code},
+    {defines, [{debug, true}]},
+    {include_dirs, ["apps/epp_proxy/include"]},
+    {output_format, formatted},
+    {verbosity, 1}
+   ]}
+].

.qlty/configs/elvis.config

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+%% Elvis configuration for epp_proxy project
+[
+  {elvis,
+   [
+    {config,
+     [
+      {dirs, ["apps/epp_proxy/src", "apps/epp_proxy/test"]},
+      {filter, "*.erl"},
+      {ruleset, erl_files}
+     ]},
+    {output_format, colored}
+   ]},
+  {erl_files,
+   [
+    {elvis_style, line_length, #{limit => 100}},
+    {elvis_style, no_tabs},
+    {elvis_style, no_trailing_whitespace},
+    {elvis_style, macro_names, #{regex => "^[A-Z][A-Z_]*$"}},
+    {elvis_style, macro_module_names, #{regex => "^[A-Z][a-zA-Z0-9]*$"}},
+    {elvis_style, function_naming_convention, #{regex => "^[a-z][a-zA-Z0-9_]*$"}},
+    {elvis_style, variable_naming_convention, #{regex => "^[A-Z][a-zA-Z0-9_]*$"}},
+    {elvis_style, no_catch_expressions},
+    {elvis_style, no_if_expression},
+    {elvis_style, no_throw},
+    {elvis_style, no_author},
+    {elvis_style, no_spec_with_records},
+    {elvis_style, dont_repeat_yourself, #{min_complexity => 10}},
+    {elvis_style, no_debug_call},
+    {elvis_style, no_common_caveats_call},
+    {elvis_style, no_nested_try_catch},
+    {elvis_style, no_seqbind},
+    {elvis_style, no_useless_seqbind},
+    {elvis_style, used_ignored_variable},
+    {elvis_style, no_behavior_info},
+    {elvis_style, module_naming_convention, #{regex => "^[a-z][a-zA-Z0-9_]*$"}},
+    {elvis_style, state_record_and_type},
+    {elvis_style, no_spec_with_records},
+    {elvis_style, callback_spec},
+    {elvis_style, no_catch_expressions},
+    {elvis_style, no_if_expression},
+    {elvis_style, no_throw},
+    {elvis_style, no_author},
+    {elvis_style, no_spec_with_records},
+    {elvis_style, dont_repeat_yourself, #{min_complexity => 10}},
+    {elvis_style, no_debug_call},
+    {elvis_style, no_common_caveats_call},
+    {elvis_style, no_nested_try_catch},
+    {elvis_style, no_seqbind},
+    {elvis_style, no_useless_seqbind},
+    {elvis_style, used_ignored_variable},
+    {elvis_style, no_behavior_info},
+    {elvis_style, module_naming_convention, #{regex => "^[a-z][a-zA-Z0-9_]*$"}},
+    {elvis_style, state_record_and_type},
+    {elvis_style, no_spec_with_records},
+    {elvis_style, callback_spec}
+   ]}
+].

.qlty/qlty.toml

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+# This file was automatically generated by `qlty init`.
+# You can modify it to suit your needs.
+# We recommend you to commit this file to your repository.
+#
+# This configuration is used by both Qlty CLI and Qlty Cloud.
+#
+#     Qlty CLI -- Code quality toolkit for developers
+#     Qlty Cloud -- Fully automated Code Health Platform
+#
+# Try Qlty Cloud: https://qlty.sh
+#
+# For a guide to configuration, visit https://qlty.sh/d/config
+# Or for a full reference, visit https://qlty.sh/d/qlty-toml
+config_version = "0"
+
+exclude_patterns = [
+  # Build and dependency directories
+  "**/build/**",
+  "**/deps/**",
+  "**/dist/**",
+  "**/target/**",
+  "**/vendor/**",
+  "**/_build/**",
+  "**/node_modules/**",
+
+  # Erlang-specific excludes
+  "**/*.beam",
+  "**/*.plt", 
+  "**/*.ez",
+  "**/ebin/**",
+  "**/log/**",
+  "**/rebar3.crashdump",
+
+  # Generated and temporary files
+  "**/generated/**",
+  "**/cache/**",
+  "**/testdata/**",
+
+  # Configuration files (keep for analysis)
+  # "**/config/**",  # Commented out - config files are important
+
+  # Documentation and assets (keep for analysis)
+  # "**/assets/**",  # Commented out - may contain important files
+
+  # Unused patterns for this project
+  "*_min.*",
+  "*-min.*", 
+  "*.min.*",
+  "**/.yarn/**",
+  "**/*.d.ts",
+  "**/bower_components/**",
+  "**/extern/**",
+  "**/external/**",
+  "**/Godeps/**",
+  "**/gradlew/**",
+  "**/mvnw/**",
+  "**/protos/**",
+  "**/seed/**",
+  "**/templates/**",
+]
+
+test_patterns = [
+  "**/test/**",
+  "**/spec/**",
+  "**/*.test.*",
+  "**/*.spec.*",
+  "**/*_test.*",
+  "**/*_spec.*",
+  "**/test_*.*",
+  "**/spec_*.*",
+  # Erlang-specific test patterns
+  "**/*_SUITE.erl",
+  "**/*_test.erl",
+  "**/test_*.erl",
+]
+
+[smells]
+mode = "comment"
+
+[smells.boolean_logic]
+threshold = 4
+
+[smells.file_complexity]
+threshold = 55
+
+[smells.return_statements]
+threshold = 4
+
+[smells.nested_control_flow]
+threshold = 4
+
+[smells.function_parameters]
+threshold = 5
+
+[smells.function_complexity]
+threshold = 8
+
+[smells.duplication]
+enabled = true
+threshold = 20
+
+[[source]]
+name = "default"
+default = true
+
+
+# Docker and containerization
+[[plugin]]
+name = "dockerfmt"
+
+[[plugin]]
+name = "hadolint"
+
+# Documentation
+[[plugin]]
+name = "markdownlint"
+mode = "comment"
+
+# Security scanning
+[[plugin]]
+name = "osv-scanner"
+
+[[plugin]]
+name = "trivy"
+drivers = [
+  "config",
+  "fs-vuln",
+]
+
+[[plugin]]
+name = "trufflehog"
+
+# Shell scripts
+[[plugin]]
+name = "shellcheck"
+
+[[plugin]]
+name = "shfmt"
+
+# YAML files (GitHub Actions)
+[[plugin]]
+name = "yamllint"
+
+# Erlang-specific plugins
+# Note: qlty doesn't support erlc plugin yet