feat: Gitea repo indexing via gRPC ReindexCode endpoint

Gitea indexer (code_index/gitea.rs):
- Walks repos via GiteaClient API (list repos → traverse dirs → fetch files)
- Base64 decodes file content from Gitea API responses
- Extracts symbols with tree-sitter (Rust, TypeScript, Python)
- Indexes to sol_code OpenSearch index with repo/branch/source metadata
- Skips hidden dirs, vendor, node_modules, files >100KB
- delete_branch() for clean re-indexing

Server-side tree-sitter (code_index/symbols.rs):
- Full symbol extraction shared with CLI client
- extract_symbols(), extract_project_symbols(), detect_language()

gRPC ReindexCode RPC:
- ReindexCodeRequest: org, repo, branch (all optional filters)
- ReindexCodeResponse: repos_indexed, symbols_indexed, error
- Uses ToolRegistry's GiteaClient (already authenticated)
- Creates sol_code index if not exists

ToolRegistry.gitea_client() accessor for reindex endpoint.

Cargo.lock

@@ -1357,7 +1357,7 @@ dependencies = [
  "libc",
  "option-ext",
  "redox_users",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -1371,6 +1371,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dotenv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
+
 [[package]]
 name = "dprint-swc-ext"
 version = "0.26.0"
@@ -3771,7 +3777,7 @@ dependencies = [
  "once_cell",
  "socket2",
  "tracing",
- "windows-sys 0.59.0",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -4705,6 +4711,7 @@ dependencies = [
  "deno_ast",
  "deno_core",
  "deno_error",
+ "dotenv",
  "futures",
  "jsonwebtoken",
  "libsqlite3-sys",
@@ -4730,6 +4737,10 @@ dependencies = [
  "tonic-prost-build",
  "tracing",
  "tracing-subscriber",
+ "tree-sitter",
+ "tree-sitter-python",
+ "tree-sitter-rust",
+ "tree-sitter-typescript",
  "url",
  "uuid",
 ]
@@ -4808,6 +4819,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "streaming-iterator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b2231b7c3057d5e4ad0156fb3dc807d900806020c5ffa3ee6ff2c8c76fb8520"
+
 [[package]]
 name = "string_enum"
 version = "1.0.2"
@@ -5871,6 +5888,55 @@ dependencies = [
  "tracing-log",
 ]
 
+[[package]]
+name = "tree-sitter"
+version = "0.24.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5387dffa7ffc7d2dae12b50c6f7aab8ff79d6210147c6613561fc3d474c6f75"
+dependencies = [
+ "cc",
+ "regex",
+ "regex-syntax",
+ "streaming-iterator",
+ "tree-sitter-language",
+]
+
+[[package]]
+name = "tree-sitter-language"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "009994f150cc0cd50ff54917d5bc8bffe8cad10ca10d81c34da2ec421ae61782"
+
+[[package]]
+name = "tree-sitter-python"
+version = "0.23.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d065aaa27f3aaceaf60c1f0e0ac09e1cb9eb8ed28e7bcdaa52129cffc7f4b04"
+dependencies = [
+ "cc",
+ "tree-sitter-language",
+]
+
+[[package]]
+name = "tree-sitter-rust"
+version = "0.23.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca8ccb3e3a3495c8a943f6c3fd24c3804c471fd7f4f16087623c7fa4c0068e8a"
+dependencies = [
+ "cc",
+ "tree-sitter-language",
+]
+
+[[package]]
+name = "tree-sitter-typescript"
+version = "0.23.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c5f76ed8d947a75cc446d5fccd8b602ebf0cde64ccf2ffa434d873d7a575eff"
+dependencies = [
+ "cc",
+ "tree-sitter-language",
+]
+
 [[package]]
 name = "triomphe"
 version = "0.1.15"