fix: Use Rust syntax highlighting for LUMOS code blocks

Changed all ```lumos code blocks to ```rust for proper syntax highlighting.

LUMOS syntax is very similar to Rust, so Rust highlighting provides:
- Colorful keywords (#[solana], struct, enum, etc.)
- Type highlighting (u64, PublicKey, Option<T>)
- Comment highlighting
- String highlighting

This fixes the monochrome code blocks issue where all text appeared
in the same gray color.

Affected files:
- api/cli-commands.md
- api/types.md
- api/attributes.md
- getting-started/quick-start.md

Author: rz1989s

src/content/docs/api/attributes.md

@@ -22,7 +22,7 @@ Marks a type as Solana-specific, enabling Solana type support (`PublicKey`, `Sig
 
 ### Syntax
 
-```lumos
+```rust
 #[solana]
 struct TypeName {
     // fields
@@ -81,7 +81,7 @@ export const TypeNameBorshSchema = borsh.struct([
 
 #### Simple Solana Struct
 
-```lumos
+```rust
 #[solana]
 struct Account {
     owner: PublicKey,
@@ -103,7 +103,7 @@ pub struct Account {
 
 #### Solana Enum
 
-```lumos
+```rust
 #[solana]
 enum TransactionType {
     Transfer(PublicKey, u64),
@@ -127,7 +127,7 @@ pub enum TransactionType {
 
 #### Non-Solana Type (No Attribute)
 
-```lumos
+```rust
 struct GenericData {
     id: u64,
     value: String,
@@ -165,7 +165,7 @@ Generates Anchor's `#[account]` macro for on-chain account data.
 
 ### Syntax
 
-```lumos
+```rust
 #[solana]
 #[account]
 struct AccountName {
@@ -181,7 +181,7 @@ struct AccountName {
 
 #### With `#[account]`
 
-```lumos
+```rust
 #[solana]
 #[account]
 struct PlayerAccount {
@@ -211,7 +211,7 @@ pub struct PlayerAccount {
 
 #### Without `#[account]`
 
-```lumos
+```rust
 #[solana]
 struct EventData {
     player: PublicKey,
@@ -254,7 +254,7 @@ impl borsh::BorshDeserialize for EventData { /* ... */ }
 
 #### Player Account (On-Chain Storage)
 
-```lumos
+```rust
 #[solana]
 #[account]
 struct PlayerAccount {
@@ -299,7 +299,7 @@ pub struct CreatePlayer<'info> {
 
 #### Match Result (Event Data, Not Stored)
 
-```lumos
+```rust
 #[solana]
 struct MatchResult {
     winner: PublicKey,
@@ -333,7 +333,7 @@ pub mod game {
 
 ### Valid Combinations
 
-```lumos
+```rust
 // ✅ Both attributes (on-chain account)
 #[solana]
 #[account]
@@ -351,7 +351,7 @@ struct Data { /* ... */ }
 
 ### Invalid Combinations
 
-```lumos
+```rust
 // ❌ #[account] without #[solana]
 #[account]
 struct Account { /* ... */ }
@@ -372,7 +372,7 @@ LUMOS intelligently detects when to use Anchor imports based on attributes in th
 
 ### Example: Mixed Module
 
-```lumos
+```rust
 // File: schema.lumos
 
 #[solana]
@@ -438,7 +438,7 @@ LUMOS chooses imports based on attributes:
 
 :::tip[Use #[account] for Persistent Data]
 If data is stored on-chain in a PDA or account, use `#[account]`:
-```lumos
+```rust
 #[solana]
 #[account]
 struct UserProfile { /* ... */ }
@@ -447,7 +447,7 @@ struct UserProfile { /* ... */ }
 
 :::tip[Omit #[account] for Events]
 Events are emitted, not stored:
-```lumos
+```rust
 #[solana]
 struct TransferEvent { /* ... */ }
 ```
@@ -459,7 +459,7 @@ Put attributes in this order:
 2. `#[account]` (if needed)
 3. Type definition
 
-```lumos
+```rust
 #[solana]
 #[account]
 struct Account { /* ... */ }
@@ -484,7 +484,7 @@ cannot find type `Pubkey` in this scope
 ```
 
 **Fix:** Add `#[solana]` attribute:
-```lumos
+```rust
 #[solana]  // ← Add this
 struct Account {
     owner: PublicKey,
@@ -501,7 +501,7 @@ struct Account {
 ```
 
 **Fix:** Add `#[solana]` before `#[account]`:
-```lumos
+```rust
 #[solana]   // ← Add this
 #[account]
 struct Account { /* ... */ }
@@ -517,7 +517,7 @@ cannot derive `BorshSerialize` when #[account] is present
 ```
 
 **Fix:** Remove manual derives - Anchor handles serialization:
-```lumos
+```rust
 // ❌ Don't do this
 #[solana]
 #[account]

src/content/docs/api/cli-commands.md

@@ -210,7 +210,7 @@ my-solana-app/
 ```
 
 **`schema.lumos` (example):**
-```lumos
+```rust
 #[solana]
 #[account]
 struct PlayerAccount {

src/content/docs/api/types.md

@@ -34,7 +34,7 @@ LUMOS supports a rich type system that maps cleanly between Rust and TypeScript.
 
 ### Unsigned Integers
 
-```lumos
+```rust
 #[solana]
 struct Numbers {
     tiny: u8,       // 0 to 255
@@ -77,7 +77,7 @@ For `u64` values larger than this, precision may be lost. Use `bigint` carefully
 
 ### Signed Integers
 
-```lumos
+```rust
 #[solana]
 struct SignedNumbers {
     tiny: i8,       // -128 to 127
@@ -96,7 +96,7 @@ struct SignedNumbers {
 
 ### Boolean
 
-```lumos
+```rust
 #[solana]
 struct Flags {
     is_active: bool,
@@ -112,7 +112,7 @@ struct Flags {
 
 ### String
 
-```lumos
+```rust
 #[solana]
 struct Metadata {
     name: String,
@@ -144,7 +144,7 @@ Keep strings short for efficient on-chain storage.
 
 Represents a Solana public key (32 bytes).
 
-```lumos
+```rust
 #[solana]
 struct Account {
     owner: PublicKey,
@@ -186,7 +186,7 @@ export const AccountBorshSchema = borsh.struct([
 
 Represents a Solana signature (64 bytes).
 
-```lumos
+```rust
 #[solana]
 struct Transaction {
     signature: Signature,
@@ -219,7 +219,7 @@ export const TransactionBorshSchema = borsh.struct([
 
 Dynamic-length arrays.
 
-```lumos
+```rust
 #[solana]
 struct Inventory {
     items: [PublicKey],
@@ -267,7 +267,7 @@ For 100 PublicKeys: 4 + (32 × 100) = 3,204 bytes
 
 Nullable fields.
 
-```lumos
+```rust
 #[solana]
 struct Profile {
     username: String,
@@ -316,7 +316,7 @@ Rust-style enums with three variant types.
 
 ### Unit Variants
 
-```lumos
+```rust
 #[solana]
 enum Status {
     Active,
@@ -358,7 +358,7 @@ export const StatusBorshSchema = borsh.rustEnum([
 
 ### Tuple Variants
 
-```lumos
+```rust
 #[solana]
 enum Event {
     UserJoined(PublicKey),
@@ -394,7 +394,7 @@ export const EventBorshSchema = borsh.rustEnum([
 
 ### Struct Variants
 
-```lumos
+```rust
 #[solana]
 enum Instruction {
     Initialize {
@@ -459,7 +459,7 @@ The following types are **NOT** supported:
 ### Workarounds
 
 **Fixed-size arrays → Vec:**
-```lumos
+```rust
 // ❌ Not supported
 struct Data {
     buffer: [u8; 1024],
@@ -472,7 +472,7 @@ struct Data {
 ```
 
 **Tuples → Struct:**
-```lumos
+```rust
 // ❌ Not supported
 struct Pair {
     data: (u64, String),
@@ -507,7 +507,7 @@ For large `u64` values, consider:
 
 :::tip[Use Option for Nullable Fields]
 Always use `Option<T>` for optional values:
-```lumos
+```rust
 struct User {
     name: String,
     email: Option<String>,  // Not all users have email

src/content/docs/getting-started/introduction.md

@@ -56,7 +56,7 @@ const GameStateBorshSchema = borsh.struct([
 
 ### With LUMOS
 
-```lumos
+```rust
 #[solana]
 struct GameState {
     player: PublicKey,

src/content/docs/getting-started/quick-start.md

@@ -65,7 +65,7 @@ my-game/
 
 Open `schema.lumos` and define your data structures:
 
-```lumos
+```rust
 #[solana]
 #[account]
 struct PlayerAccount {