feat: add FIM, files, fine-tuning, batch, OCR, audio, moderation, and agent endpoints

New API endpoints with sync + async support:
- FIM (fill-in-the-middle) completions for code completion
- Files API: upload, list, get, delete, get URL
- Fine-tuning: create, list, get, cancel, start jobs
- Batch jobs: create, list, get, cancel
- OCR: document text extraction with page/table options
- Audio transcription: speech-to-text with diarization
- Moderations and classifications: content safety
- Agent completions: run pre-configured agents

src/v1/fine_tuning.rs

@@ -0,0 +1,101 @@
+use serde::{Deserialize, Serialize};
+
+use crate::v1::constants;
+
+// -----------------------------------------------------------------------------
+// Request
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct FineTuningJobRequest {
+    pub model: constants::Model,
+    pub training_files: Vec<TrainingFile>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub validation_files: Option<Vec<String>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hyperparameters: Option<Hyperparameters>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub suffix: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub auto_start: Option<bool>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub job_type: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub integrations: Option<Vec<Integration>>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct TrainingFile {
+    pub file_id: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub weight: Option<f32>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Hyperparameters {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub learning_rate: Option<f64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub training_steps: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub warmup_fraction: Option<f64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub epochs: Option<f64>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Integration {
+    pub r#type: String,
+    pub project: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub api_key: Option<String>,
+}
+
+// -----------------------------------------------------------------------------
+// Response
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct FineTuningJobResponse {
+    pub id: String,
+    pub object: String,
+    pub model: constants::Model,
+    pub status: FineTuningJobStatus,
+    pub created_at: u64,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub modified_at: Option<u64>,
+    pub training_files: Vec<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub validation_files: Option<Vec<String>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hyperparameters: Option<Hyperparameters>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub fine_tuned_model: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub suffix: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub integrations: Option<Vec<Integration>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub trained_tokens: Option<u64>,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum FineTuningJobStatus {
+    Queued,
+    Running,
+    Success,
+    Failed,
+    TimeoutExceeded,
+    CancellationRequested,
+    Cancelled,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct FineTuningJobListResponse {
+    pub data: Vec<FineTuningJobResponse>,
+    pub object: String,
+    #[serde(default)]
+    pub total: u32,
+}