Add human-readable size parsing and CLI/env configuration for cache settings (v0.2.0)

[Copilot]

Extends configuration system to support human-readable byte sizes and adds CLI/environment variable overrides for cache-related settings.

Changes

Human-readable size formats

• max_item_size and disk_cache_max_size now accept "10M", "1G", "10MiB", "1GiB" etc. alongside numeric bytes
• Uses bytesize crate for parsing (supports both decimal MB/GB and binary MiB/GiB units)
• Backward compatible with existing numeric byte configurations

[cache]
max_item_size = "10MiB"           # Binary: 10 * 1024²
disk_cache_max_size = "1GB"       # Decimal: 1 * 1000³
# OR numeric bytes (still works)
max_item_size = 10485760

CLI options

• --forward-headers / --no-forward-headers
• --disk-cache / --no-disk-cache
• --disk-cache-path <PATH>
• --disk-cache-max-size <SIZE> (accepts human-readable formats)

Environment variables

• FORWARD_HEADERS_ENABLED (boolean)
• DISK_CACHE_ENABLED (boolean)
• DISK_CACHE_PATH (string)
• DISK_CACHE_MAX_SIZE (supports human-readable formats)

Configuration precedence remains: env vars > CLI options > config file

Version

• Bumped to v0.2.0

Original prompt

• make max_item_size and disk_cache_max_size in config also recognize sizes like "10M", "1G", etc
• make forward_headers_enabled, disk_cache and related setting configuarable from command line options and env variables
• bump version to v0.2.0

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[Copilot]

Pull request overview

Extends Akkoproxy’s configuration system to accept human-readable byte sizes for cache limits and adds CLI/environment-variable overrides for cache-related settings, alongside a version bump to v0.2.0.

Changes:

• Add bytesize-backed parsing so max_item_size and disk_cache_max_size can be configured as either raw bytes or human-readable strings.
• Add CLI flags and environment variables to override forward_headers_enabled and disk cache settings with defined precedence.
• Bump crate version to 0.2.0 and document changes in the changelog and example config.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/main.rs	Adds CLI flags, env var overrides, and size parsing helper for disk cache max size.
src/config.rs	Adds custom serde deserializer to accept numeric or human-readable size strings; adds tests for parsing.
config.example.toml	Updates examples/comments to show human-readable cache size formats.
Cargo.toml	Bumps version and adds bytesize dependency.
Cargo.lock	Updates lockfile for v0.2.0 and adds bytesize.
CHANGELOG.md	Adds v0.2.0 release notes and updates comparison links.

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