Fix optional vector serialization in ReplyParameters

[Copilot]

Issue #6 identified that optional vector fields like ReplyParameters.quoteEntities were always serialized as empty arrays [] when unset, violating Telegram Bot API spec which requires omitting unset optional fields entirely.

Changes

• Type definition: Wrapped ReplyParameters.quoteEntities in std::optional<std::vector<MessageEntity::Ptr>>
• JsonWrapper serialization: Added template overload for std::optional<std::vector<T>> that skips serialization when empty, serializes vector (including empty []) when set
• Parser logic: Updated FROM_JSON to conditionally populate field only when present in input; TO_JSON now leverages optional-aware serialization

Behavior

// Before: always outputs "quote_entities": []
auto params = std::make_shared<ReplyParameters>();
params->messageId = 42;
// JSON: {"message_id": 42, "quote_entities": []}  ❌

// After: omits field when not set
auto params = std::make_shared<ReplyParameters>();
params->messageId = 42;
// JSON: {"message_id": 42}  ✓

// After: includes field when explicitly set
params->quoteEntities = std::vector<MessageEntity::Ptr>{};
// JSON: {"message_id": 42, "quote_entities": []}  ✓

This pattern applies to all optional vector fields and prevents API errors from sending unnecessary default values.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

check issue #6 and figure out a way

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[Royna2544]

@copilot Can you find any other things that is said as "Optional" yet not wrapped?