Crypto cache refactor

[dbrowne]

Separate crypto-loaders crate and add unified cache implementation

• Create new crypto-loaders crate for non-AlphaVantage crypto data
• Move CoinGecko, CoinMarketCap, CoinPaprika, CoinCap, SosoValue providers
• Add CryptoSymbolLoader, CryptoMappingService, and details loader
• Implement unified CacheHelper with CacheConfig and CacheConfigProvider trait
• Refactor price loaders to use CacheRepository instead of direct DB connections
• Add standard cache TTL constants and key prefixes
• Refactor av-core market types into separate modules

[Copilot]

Pull request overview

This PR separates non-AlphaVantage crypto functionality into a new crypto-loaders crate and refactors the existing loader stack to use a unified, repository-based caching interface while also modularizing some av-core market types.

Changes:

• Added new crates/crypto-loaders crate with providers (CoinGecko/CMC/CoinPaprika/CoinCap/SosoValue), core types, errors, symbol/details loaders, metadata, mapping, and social modules.
• Introduced av-loaders::cache unified cache helper/config + TTL/key constants, and refactored multiple loaders to use CacheRepository instead of raw DB connections.
• Updated av-client construction APIs to return Result (and updated call sites), and refactored av-core::types::market into submodules with re-exports.

Reviewed changes

Copilot reviewed 75 out of 78 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/crypto-loaders/Cargo.toml	New standalone crate definition and deps for moved crypto loaders/providers.
crates/crypto-loaders/src/*	New crypto-loaders API surface: types/errors/traits + providers + loaders + mapping/metadata/social modules.
crates/av-loaders/src/cache.rs	New unified cache config/helper + TTL/key conventions for loader caching.
crates/av-loaders/src/*loader.rs	Updated multiple loaders to use CacheRepository and TTL constants via CacheConfigProvider.
crates/av-loaders/src/crypto/*	Re-exports/adapters/wrappers integrating crypto-loaders into av-loaders.
crates/av-client/src/{transport,client}.rs	Transport::new and AlphaVantageClient::new now return Result, with updated docs/tests.
crates/av-database/postgres/src/repository.rs	Faster failure behavior for DB context creation + pool connection timeout.
crates/av-core/src/types/market/*	Split market types into modules and re-exported through types::market.
crates/av-cli/src/commands/load/*.rs	Updated CLI client construction to handle AlphaVantageClient::new -> Result.
Cargo.toml / Cargo.lock	Added new workspace member crypto-loaders and updated lockfile.

Files not reviewed (1)

• .idea/alphavantage.iml: Language not supported

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