refactor: simplify config resolution and consolidate main.rs init (#287)

* refactor: simplify config resolution and consolidate main.rs init into AppBuilder

- Add parse_bool_env() and parse_string_env() helpers to eliminate repetitive
  5-line optional_env/parse/map_err/unwrap_or boilerplate across 12 config files
- Add EmbeddingsConfig::create_provider() to centralize embeddings construction
  (fixes hardcoded 1536 dimensions and missing Ollama provider in app.rs)
- Extract init_cli_tracing(), setup_wasm_channels(), start_tunnel(),
  run_memory_command(), run_worker(), run_claude_bridge() from main.rs
- Replace ~600 lines of inline init in main.rs with AppBuilder::build_all()
- Expose catalog_entries from AppComponents for gateway registry entries
- Net reduction: ~738 lines across 15 files

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: propagate dev_loaded_tool_names from AppBuilder and add parse_option_env helper

Address PR review feedback:

- Capture dev_loaded_tool_names from WASM loading in init_extensions()
  and expose via AppComponents so bootstrap_hooks receives the actual
  dev tool names instead of an empty slice (fixes silent hook skip)
- Add parse_option_env<T>() helper for Option<T> config fields,
  simplifying max_cost_per_day_cents and max_actions_per_hour in agent.rs

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: fetch real NEAR AI pricing and unify cost calculation path

CostGuard was independently looking up pricing via costs::model_cost(),
falling back to GPT-4o default rates when NEAR AI model names didn't
match the static table — causing ~3x cost overestimates in logs.

- Add pricing map to NearAiChatProvider that fetches real rates from
  /v1/model/list at startup (background, non-blocking)
- Update cost_per_token() to check fetched pricing first, then static
  table, then default
- Add cost_per_token parameter to CostGuard::record_llm_call() so the
  dispatcher passes provider-sourced rates directly

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* chore: update default NEAR AI model to GLM-latest

Replace fireworks llama4-maverick-instruct-basic with zai-org/GLM-latest
as the default model in config and setup wizard.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: align wizard default model name with config

Change "zai/GLM-latest" to "zai-org/GLM-latest" in wizard.rs to match
the default in config/llm.rs.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

---------

Co-authored-by: Claude Opus 4.6 <[email protected]>

Cargo.lock

@@ -4975,15 +4975,6 @@ dependencies = [
  "syn 2.0.114",
 ]
 
-[[package]]
-name = "servo_arc"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "170fb83ab34de17dc69aa7c67482b22218ddb85da56546f9bd6b929e32a05930"
-dependencies = [
- "stable_deref_trait",
-]
-
 [[package]]
 name = "serde_yml"
 version = "0.0.12"
@@ -4999,6 +4990,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "servo_arc"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "170fb83ab34de17dc69aa7c67482b22218ddb85da56546f9bd6b929e32a05930"
+dependencies = [
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.6"